USF since the kid is squemish as you put it.
He'll enjoy MIB, and if he has the courage, can go on the Mummy if he makes the height requirement. Then he'll see Hulk in the distance at IOA and you can tell him you'll come back another time if he gets good grades. Kids like to be scaredy cats for the attention it brings. Eventually, they get the courage up when seeing kids their age or younger on the ride. If the kid doesn't want to go on the ride, just say ok, and move on. They'll think about it during the day and want to come back later.
Don't go on BTTF, it will make you sick.