Honestly, I am all about relaxing in the room or resort/pool jacuzzi after a day at the parks. But I also like:
Rick's bar/club at Coronado Springs
Winter/summerland mini golf
Jelly Rolls or just strolling on Boardwalk
and as someone said.. "closing" the parks. We took our sweet time one night at EPCOT and got amazing night time pics of the various countries with no one in the shots.