It might be do-able, but it won't be enjoyable. We took two full days there and could have used a third. At IOA, If you have little ones, they will not want to leave Suessville. We spent a couple hours there, eating green eggs and ham, riding rides, getting autographs and playing in a special area with neat surprises. You can also meet all the X-Men. This was such a great park. Your son would probably love MIB at Universal. My kids rode many, many times. In fact. they rode the last ride and spent so much time in the gift shop, we were the only ones left in the back of the park and didn't see anyone else besides security, until we made it back to the front of the park.