One of my faves is to walk thru the Disney Gallery at Disneyana, I just love anything vintage, and especially vintage Disney, and there is a lot of memorabilia there.
Grab a snack and/or drink and head over to Tom Sawyer Island and just walk around or sit and relax. It’s a great place to get away from the crowds for a bit, and something is just so peaceful over there.
We stay at GCH because we’re DVC, but I also love to walk the grounds at DLH just because it’s so pretty and again, peaceful. It’s very lush and green, with pretty flowers and plants/trees, seems very tropical, plus, it’s the original hotel and the classic charm is still there.
Everything else is pretty much a given… ride all of the rides, eat all of the food, see all of the characters. There’s just too many things to list in those categories, but I really love finding relaxing areas and things that aren’t the obvious choice of the masses… but no matter how long we’re there, it always seems too short!