Many people with motion sickness cannot handle coasters with corkscrews (though loops are usually fine). For that reason I can't do Rock and Roller Coaster (because of the corkscrew). Let's see. Other rides that I can't do: Body Wars, Star Tours, I also have to close my eyes during that one part of Buzz Lightyear, Mission Space, Primeval Whirl.
But more importantly, rides that I CAN do despite motion sickness: kali river rapids, tower of terror, thunder mountain, test track, splash mountain, space mountain, others that i can't think of right now.