If you want to expierence the best time using the watermice, go to the magic kingdom and hop on a ferry to fort wilderness. You can also go to the marketplace in downtown disney and ride the watermice but your limited on speed and area. They dont go as fast as the ones at fort wilderness because of the slow-wake zones. I highly recommend these fun exciting boats, but you must be 13 or 14 years to ride by yourself. If your too young to ride them by yourself, its just as fun with mom, dad, or even an older sibiling.:yahoo:
You can also rent them from the Yacht Club.
The Grand Floridian NEVER had a wait for them when I went. Definitely pick a Magic Kingdom area resort because you get the biggest water area. Don't go to the Contempory...very busy.