Absolutely Soarin and Test Track at EPCOT, I would do the mild version of Mission Space before you attempt the full-on version just so you get an idea of what the ride is like before you commit to the centrifugal force - it's intense! Actually, everything at EPCOT is fun, make sure you check the schedules for the shows at the countries, the Chinese acrobats and UK Beatle show's are amazing!
Magic Kingdom for adults I would say there are less "must do" rides - Splash Mountain, Big Thunder Mountain, Haunted Mansion, Hall of Presidents, Monsters Inc. - the rest are fun but are geared toward children. (Space Mountain will still be closed otherwise that would be on my list too)