We also are a family of 5 and we just got back a couple of weeks ago from POR. Here are some of the things that worked for me. (I hate clutter so keeping the room neat was my "mission"!)
*Invest $5 in a pop-up laundry hamper from Family Dollar. I put it in the corner beside the sinks and under the closet pole. It kept all of our dirty clothes neat and in one place.
*Definitely get an over the door shoe organizer. In my experience, it is not convenient to use on the bathroom door as it keeps it from shutting, but I hung it on the closet pole. I put all of our toiletries (toothpaste, makeup, hair gel, deodorant, etc) in it. I gave each person a pocket and all of their personal items were together. I also put the sunscreen, first aid items, baby wipes, etc in the pockets. It kept me from having to open suitcases to find anything.....it was all at my fingertips.
*I used the table for "storage" of daily items such as small souvenirs, pressed pennies, mister fans, etc. Each child had a pile and everything they accumulated went in the pile. (Next time I'll bring small baskets.) These things easily become spread all over, so it was nice to have a place the kids could dump their stuff.
*I brought a few of my own hangars with clips on them (the kind you get at the store when you buy a skirt). I used them to hang wet suits and towels as there is never enough space on the line in the bathroom.
*We used the coathooks to hang our lanyards and hats. That way we knew where everyone's ticket was and that it was ready for the next day.
*We stored all luggage under the beds. We had 6 bags and 5 carryons.
*I used the drawers and armoire to store all of our clothing. It all fit.
I know I'm starting to sound a little crazy, so I'll stop there! I found a lot of helpful organizational tips on this board and used them all! We absolutely LOVED POR and I hope you have a great vacation!
OH--one more thing. We got these things as a promo from my husband's work that worked like a charm for the kids to carry pennies and quarters to the parks.
Not sure where to find them, but they were great! They go around your neck and the lid screws off. They were the perfect size for pennies and quarters and the kids could carry them themselves!