Mission Space is a good one to get. So is Maelstrom if you hit it later in the afternoon.
Me, I'd get Soarin, SSE and Maelstrom. I'd do Test Track first thing in the morning, then Mission Space and Ellen...then to Sunshine Seasons (bite to eat, with any luck, still breakfast with that berry pudding thing), Living With the Land, Soarin, Figment, Nemo and SSE on my way out for a break. Come back later and do the World Showcase (and use that Maelstrom one.)
At DHS, I'd get ToT, RnRc and TGMR. I don't know how close together you can make them, though. I'd want ToT and RnRc back-to-back. If not, I'd try to schedule one for before a BatB show and one for after. Go ride Toy Story first, then Ariel and One Man's Dream, go see Muppets, TGMR, eat and back to the ToT, BatB, RnRc thing.