I compiled these from a post on another thread. Any others to add?
Boarding Tips
Wear your swimsuits under your clothes when boarding, or bring them in a day bag.
There are bathrooms right outside Topsiders. Get the pool to yourselves for almost an hour
DON'T WAIT IN THE KIDS CLUB REGISTRATION LINE AT THE PORT!!!! Seriously, the line seemed to be over a hundred people long at most times (we were there around 11:00 AM and boarded around 12:30 PM). When you get on the ship just go to the kids club, we went to the Oceaneer's club on Deck 5 and registered in about 5 minutes (and got our pager).
DO YOUR CRUISE DOCS ONLINE AND PRINT THEM OUT!!!! So many people DO the online registration, but they forget to print them out and bring them with them. If you don't print them out, you have to do it all over again at the port
Cabin Tips
Over the Door shoe holders - shoe organizer was amazing! we have five people - so everyone got one row (oldest/tallest on top) to keep personal items and lanyards and such
If you have to have an inside stateroom, book on deck 7 aft, so you'll have the "secret verandah" to go out and enjoy.
The "secret" cat 7 rooms on deck 7 (used to be cat 5)
Mickey Mouse wake-up call
Feather Pillow - ask your stateroom attendant if you want one
Bring extra hangers! There isn't much drawer space in the cabins. or Better yet, leave the hangers at home and ask your stateroom attendant for more
The coffee table raises up to make it easier to sit on couch and eat from room service
Extension cord -- Used ours constantly, iPod, hair dryer, cameras, travel clock, etc., easy to plug things in overnight and take them for the next day
Ask the room steward to remove your coffee table and he did. We didn't use it and it gave us a lot of needed floor space!
Bring 2 bungee cords if you have connecting rooms to keep the doors open. They are heavy doors and will not stay open by themselves. If closed you cannot open them from the other stateroom. The cords worked great! You need one for each door.
The Glade Flameless candle was a great addition to our stateroom. Not only did it give the room a constant "pleasant" aroma... but it served as a great night light! We also brought along a mini fan. It wasn't used for cooling purposes but worked great as an air circulator in our inside stateroom.
3M command hooks are great for hanging hats & jackets/sweaters
Those close pin type magnets work wonders on the metal doors to hang lanyards and the navigator
Food Tips
Mickey bars, which aren't listed on the menu but ARE available from room service
Order room service the night before a port visit, and pack it and take with you as a snack
Order room service, sandwiches or go up and get burgers or chicken strips on
Deck 9, put them in Ziplocs and bring them with us on our excursions
Carry-on beer and wine
Cookies BBQ, the line right in front is sometimes long (facing beach) go around the right side, and you'll find another serving station that is usually empty
Room service cake of the day!
Order coffee, etc via room service the night before so it is delivered the next morning
Arrive 5-10 minutes after your scheduled dining seating time. There are no points for being the first 50 into the dining room. Avoid the lines and the cattle waiting to be seated
Candy for movies and shows
Pack Ziploc baggies. Order a sandwich or 4 from room service before going on shore and then pack in the baggie - walking around lunch/snacks for on shore. Best of all - "free
If you can't decide what to what to order for dinner, choose both. One night DH & I got an EXTRA dinner to spilt and another night my Dad actually orders 2 of the appetizer he wanted. That was the same night DH & I ordered our appetizer from the kids menu
If you have a late seating for dinner on pirate night...don't eat...there is a beautiful buffet on deck
Souvenirs
You can have your purchases sent to your stateroom from the shop on CC. I was hoping I didn't have to bring my stuff with me on the beach!
Take a roll of bubble wrap for anything you buy that's breakable
Laundry pen for t-shirt autographs
Take a pillowcase or picture frame or whatever to guest services at the beginning of the cruise and leave it with Sharpies and request just princesses, Fab 6 or all the characters sign it
Buy the matte, take the cellophane off of it, and bring it on board with you. You can either give it to guest services for the characters to sign (you'll get it back on Friday night of the cruise), or you can take it around by yourself and have it signed by whoever you want throughout the cruise. Very important tip here, have a photo direction (vertical or horizontal) in mind before asking for signatures, that way you'll know which way they should sign. As you get the professional pictures taken throughout your cruise, you can ask the photographer to take them any direction you want.
If you are a scrap booker, the evening before disembarking, pick up extra luggage tags of all the characters - great for your scrapbook pages!
If you scrapbook - take a plain scrapbook page and pen to dinner one night and have your servers sign them...because you *will* have pictures of them and it is nice to have a memento from them. Do the same for your, travel companions, table mates, room steward and other cast members you associated with often or enjoyed. Take pictures with the cast members, they like knowing you enjoyed their work and efforts.
You can turn off charge privileges on your kids KTTW card but you can add a preset amount for them to use for smoothies, movie candy, arcade, etc.... this saves them running up big $$ on the room account but they still have some "pocket money".
Give the photographer or his assistant your camera too and ask them to take your picture with it...they will
Keep piling up your pictures in Shutters, one behind the other, until the end of the cruise. Then you can pick out the best of the best to use with your package.
Take all the memory cards you own. once you've finished one, put it in a separate place from your camera so if you lose one, you don't lose both
Don't buy souvenir Tshirts for the kids -- they get them and Mickey ear graduation hats for free from the Kid's club the day before the cruise ends
Take your own pics at EVERY opportunity that the photogs do or ask them to take the pics -- we didn't buy one single photo from shutters because ours were identical!
Toiletries/Meds
I also need good old chapstick after a day in the sand and wind.
My dermatologist recommended Neutrogena sunscreen with SPF 70 (with helioplex)- it was fabulous. We made sure to reapply every few hours, but none of us had any problems with sunburn issues- and we spent a good 6 hours in the water at CC.
There is free dramamine in a box outside of the first aid station on deck 1
If you use a loofah and body wash at home -- buy the Huggies brand disposable wash clothes with body wash in them, cut them in half and use and dispose
If the ship's stores are closed and you need a toiletry item of some kind for the ladies, like tampons, you can ask at guest services and they will get some out of the back room and give them to you discretely in an envelope. They also have aspirin and seasick meds. No charge
Downy wrinkle spray...works great
Lysol everything. You can even ask for one of the tubs of hand wipes in your room!
For our family of 5, we needed one full can of sunscreen for every port plus half a facial sunscreen stick. We also needed one can for every two days on the ship.
Misc Tips
Purchase pirate gear ahead of time (Party City, etc.)
Re-book on board! Save at least 10% on your next cruise
Buy your own cruise insurance
***************** and dcltribute.com also seem to have good information
Booking excursions on your own, most are very easy to get to on your own and are much cheaper than if you book them through
DCL
Pack half the clothes and twice the cash
Get your bill from guest services midweek, just to see how much you've spent, and also incase they do make a mistake or two.
Pack clothes with dry cleaners plastic between layers and ROLL to avoid wrinkles -- we had none when we unpacked
If you have kids don't bring a white board or water bottles -- they give them away for free in the kids' clubs and Ocean Quest
Make contact with the entertainment staff running the programs -- when they see you, they tend to call your kids up on stage
Take everything you can that is disposable and just leave it there.
Before you leave, if you have extra supplies, ask your servers or host if they would like them. My servers practically jumped up and down at the prospect of getting my shoe organizer! I wound up giving her the organizer, humidifier, full size conditioner, lysol and room fresheners. The crew doesn't get off the ship much, so they're very appreciative!
Take advantage of the $15 day pass to the Rainforest Turkish bath in the spa. It was absolutely amazing and my pores are still looking amazing! Next time, I'm getting the week pass.
This one was by accident thanks to my DIS buds on board: take glow sticks for when you're meeting each other in the theater and it's pitch black -- they are the only way you'll find each other!
I always bring two rolls of quarters for the laundry. That way you don't have to "flatten" your one dollar bills, or pull from your room service tip stash.
Call before boarding the ship to find out the list of movies playing: 1-888-325-2500
. It's kind of neat to get change back in their currency too. Another "souvenier" 
My husband would never admit he had a favorite but I would nominate him for goofy or mater from cars, lol! 
My husband would probably walk or jog, but he would much rather lift weights if they have a decent selection in the gym. He would also probably like to shoot some hoops with any other interested guys.
I spent most of the day yesterday putting them together, just a few finishing touches. I'm getting sooooooo excited I can hardly stand it!
Off to bed...work tomorrow. 
. There weren't many that I didnt' have, but I'll also add:
