Hmmm.... there are the obvious things, like watch the shows, say Hi to mickey, have a drink around WS, but for the little things that I enjoy and are considered a must do for me I'd say:
-Enjoy a glass of wine at the GFlo, relax, listening to the band and the piano playing, a nice indoor break
-Do the same with a moonshine over at Fort Wilderness in a rocking chair, or down at the beach. This is often paired with a dinner at Trails End or Hoop, or fireworks from the beach
-Say goodbye to the park and thank Walt for everything he created from the top of the train station at the end of each trip