O.K. don't laugh! I feel silly asking this question,buy I really don't know. Are IOA and US two different parks? Do you buy separate tickets? I had know plans to visit either, but our friends say we must go! We will have 3 adults, DS 9, DD 4, and DS 2 on our trip. Is there something for everyone? We could spilt-up the group and see different things. Can you do both parks in one day? I really don't want to give-up any more disney time. Thanks for your help!