1. It's a vacation, not boot camp.

Take time to rest and enjoy your scenery. Take cues from your children if you're taking them. If they need a break, take one. You'll never see it all in one shot.
2. Comfortable shoes. Even if they are the ugliest ones you own, bring them. Don't make the mistake of taking a new pair thinking you''ll "break them in". MISTAKE!
3. Take a day between parks to rest. Everyone told me that and I didn't listen. We were exhausted after our first trip. Absolutely exhausted.
4. If your camera requires batteries, take 6 more than you plan on because you'll need them and you won't want to pay the ridiculous prices in the park for them.
5. Don't eat like it's your last meal.

Seriously, the portions are so big and add that with the heat of Florida, it's not always a pleasant mix! If you're in a resort that has fridges in the rooms, get your dessert to go. They'll give you napkins and forks. And there's nothing quite so decadent as enjoying a triple chocolate cake at 10pm while the kids splash around in the pool. Aahhhh.
6. Refillable Mugs - these truly are a good bargain AND a useful souvenier. One of the few travel mugs that we own that don't leak, easy to clean and a nice little memory. And the free beverages ain't bad either!!
7. Laundry - no one wants to think of doing laundry on vacation, but I've found that Florida is so hot that we go through more clothes than we anticipate. When we're on our way to the pool, I throw in a couple of loads once during the middle of the trip so we have fresh undies, shorts, socks, etc. I usually bring laundry soap and fabric softener samples with me to avoid having to buy them at the resort in the machines. And I save up American quarters too. It's only an hour of time for three days (or more) worth of fresh, clean clothes. And we're at the pool anyway!
8. This isn't so much of a tip but just something I like to do: I will ask people if they would like me to take their photos. Especially couples and families so everyone can get in the shot. People are always so grateful and it takes a minute out of your time to make someone really happy.
9. Take the boat rides whenever possible and talk to the captains. They often have some great trivia about disney.
10. Get a free piece of chocolate from Ghiradelli's in Downtown disney. It's a nice little freebie!
I could spend all day writing tips!!