I am going to myrtle beach in october

the family kingdom will be closed then, so i was looking at either going to hard rock park or nascar speedpark

does anyone have any advice, my son is 4, i want to make sure i go somewhere that would be fun too him. (any advice on aquariums or shows, would greatly be appreciated.)

Thanks

we have already made our hotel plans , and the hotel has a huge indoor water park. so that is taken care of.