It always depends...
Our "must-do's" always depend on where we are staying. As DVC members we stay at different locations each trip, so here are the "must-do's" upon arrival at the resorts... notice most are food related!
The Boardwalk - eat at the ESPN Club.
Saratoga Springs - eat at the Turf Club.
Beach Club Villas - Sit in the lobby and walk the halls.
Wilderness Lodge - Get a cup of coffee and sit in the lobby.
Old Key West - eat at Olivia's.
As far as the property as a whole... here are our "must-do's";
Magic Kingdom - Just stepping onto Main Street and walking the shops. Buzz.
EPCOT - Dinner at the Rose & Crown.
Studios - eat at the Brown Derby, pictures on "Streets of America"
Animal Kingdom - walk the Maharaja Jungle Trek, to the see the big Kitties!