Universal hotels allow pool hopping, that might be where you had heard that
If you and your DH enjoy social drinking, you could do a monorail drink-a-thon, and stop at the lounge at each monorail hotel for their signature drink and to look around. OR even do a progressive dinner between the 3 hotels, appetizers and cocktails at one lounge, entrees at another hotel restaurant, and desserts at the last (monorail resorts consist of Poly, Grand Floridian, and Contemporary).
Wilderness Lodge is gorgeous, and an easy jump from MK by boat if you want to schedule a meal there or something and head over to check it out and dine. They have a geyser that goes off, a beautiful lobby with a stream going through it, and a pretty view of the lake. AKL is another gorgeous hotel, and of course you can see the animals on the savannah (though you're not as likely to see them in the heat of the day). AKL has some unique items in their giftshop, as well.
Lots of photo ops at all the resorts, IMO. Also, if you enjoy boating, you can rent a searaycer at one of the hotels and cruise the lagoon for awhile.