I can speak only to the SeaWorld issue. We stayed at the Polynesian in August. We walked over to the TTC and got the Lynx but (Orlando's public transit). It's stop is right by the WL bus stop at TTC. It is $1.25 pp each way. Exact change please. Tell the driver you want to go to SeaWorld, main entrance. You will get dropped off at the parking lot. You hoof it across and there is the entrance. Just reverse it for going back. Quite easy and inexpensive. As far as IOA and Universal, I don't know if there is an easy way. Maybe just getting a towncar for about $50. Or just renting a car for your stay.