Start with something that'll put you in a Disney mood right away - if you get there at park opening, go for one of the slow-loading classics before the lineups get too long: Dumbo, Peter Pan, Teacups, Astro-Orbitor (my fave to start the day, great view of Fantasyland and Tomorrowland) or Mickeys Philharmagic. If lineups are long on those already, go for It's a Small World or Pirates of the Caribbean.