There is probably a thread on this over at the SEAWORLD board but , yes we did this last year. There were actually several coaches all leaving SeaWorld around 9.00am. You need a Busch gardens entrance ticket to get on and I think the cost was about $10 per person return.
PS You may need to book a seat as it was VERY popular when we went in June.
Again you'll probably get more info on the SeaWorld board itself.
Dreams Unlimited Travel is committed to providing you with the very best vacation planning experience possible. Our Vacation Planners are experts and will share their honest advice to help you have a magical vacation.