We walked to both seaworld an aquatica.
aquatica is farther and a more tricky(no sidewalks)
there is a shuttle bus BUT times are very restricted, hold hand out looking for tips and by the time you wait, ride, park you could easily be there with a nice walk maybe 5-10 minutes
aquatica is farther but again no sidewalks we walked there but were so pooped from the heat and day we took a cab home 6.00