I always try and plan one new or special event for each trip. we did the keys to the kingdom tour where they take you into the utilidor, that was ok, but it is a lot of walking and takes a lot of your day. but glad we did it once. another trip, dh and dd did epcot's dolphins in depth, they enjoyed that too. you can see what's avail on Disney's site, click on "things to do" and then on "events and tours". don't know if you are only interested in on property ideas, but if you have a car and don't mind an early morning drive- years ago we went to crystal river to do a manatee tour. you get on a boat and wear a wet suit. they take you out and you get in the water and manatees will actually approach you if they want to interact. it was so nice, they didn't chase them, but let the manatee come to us. you can also just be a spectator on the boat. they are so gentle and nice, wonderful experience.