if you are looking for a pool the marriott resort in orlando world center is the best pool out of all the Marriotts I have ever been to. It has a few pools joint together by a circular run that you can travel slowly and takes about 5 minutes. You can also stay in any one of the stationary pool waters buy a float for $10 and just float in the water run the rest of the hotel is just average but you can also visit other places in Orlando
The World Center is nice, but the JW Marriott Orlando Grande Lakes pool is breathtaking, especially at night. I've stayed at both over the past year. Go with the JW and make sure you get a nice high center pool view. That plus the golf course in the background and as a side bonus you can see the Disney fireworks at night. Only disadvantage is it's a 5-10 minute drive to most of the Orlando sites.
I loved the Marriott Resort at Singer Island/West Palm Beach. All suite resort with washer dryer combos in rooms. Two pools, and is Beach front. Very relaxing, and not commercialized. Easy drive to City Center if you want some shopping and good dinning.