If you go to the space beside the reception (the time share sellers,no prob there, all the hotels on hotel plaza blv do this for you at the time share sellers booth)
they will book a sheared shuttle (Mears) for you. It cost 20$ (or 22) pr person round trip. (universal)
I think the price are the same for sea world,but

you can take the LYNX bus from outside the hotel (walk 2 min,direction xroads). Leaves 2 times a hr.
Cost 2$ and 1$ for kids.
That bus do NOT stop outside seaworld but at the end of the parking lot of seaworld.
Have a great stay
Ed: Just contact my email if you need any more info