There are only three rides to be concerned with: Hulk, Doctor Doom, and Dueling Dragons. At all 3, they have test seats available out front so you can check how comfortable you'd be in the seat. Hulk and Dragons both have larger size seats available, which are in the 3rd and 6th rows. Doctor Doom has just one size seat. If you can bring the harness down and clip the belt, you're set. The rest of the rides (except Dudley Do-Right and Storm Force) have lapbars of some sort, so those you dont have to worry about.