Hi
You didn't mention which Disney hotel you are staying at but they all have very nicely themed pools, some nicer than others.
You may want to consider entending your stay at Disney 1 more night and enjoying the pool right there. It eliminates the whole packing/unpacking for just one night. Or maybe make the pool day midway through your trip as a way to break up the possible commando theme park touring.
Another suggestion would be to spend a day at one of Disney's waterparks. They are wonderfully themed and are a great way to spend a day in the water.
As others have mentioned the Orlando area has tons of hotels with great pool areas, I personally prefer to get unpacked once and not have to think about it again until the end of the trip.
Whatever you choose, enjoy your trip.
Noreen