DD was 3 on our last trip (she's tall) but the only things she couldn't ride were Rock 'n' Roller Coaster, Primeval Whirl, Space Mountain, and Expedition Everest. We chose to skip Tower of Terror, Mission SPACE (really more for my benefit that hers!), and Dinosaur. We also don't do Tough to be a Bug anymore either. My child doesn't get scared of anything and we had to take her out of that attraction.