There are free shuttles to the Mariott (in water show-free) and the convetion center.
Best place to park is at the garage RIGHT accross the street from the Mariott, then catch the shuttle to the convention center.
It is a ZOO trying to park near the convention center!!!!! Then try to leave afterwards!!! From the Mariott, there is ALWAYS parking, easy acees to the interstate and very low traffic. Try to plan to park around 9:00 am. There will be lots of spots and no lines for the shuttle.