I love to tour all of the resorts especially at night. They are all so romantic to look around at night. I also agree with the above threads suggestions but here are a few others:
Go to POR, have dinner, take a carriage ride, take the boat ride to DTD and back, then go sit in the lounge and wait for Bob to start his show (usually plays Wed- through Sat.). His show is free and seats fill up quickly - he starts around 9:30 or 10:00 and he is so much fun to watch. If you not to tired after his show you can walk over to POFQ and check out that resort as well and get dessert (try an order of beignets).
WL is also wonderful. Have dinner and tour the property, make sure you watch for the geyser to go off and take the boat to MK then hop on the monorail and tour those resorts.
Don't forget about the Boardwalk area at night has nightclubs and places to eat and bike rentals.
Go for a game of minigolf or see Cirque DuSoleil.
During an afternoon, you can rent horses at Fort Wilderness and tour the area that way. They also have hay rides for a minimal amount.
Enjoy.