Ok I actually found the website for the Oasis, and I drove by on the way home, PLENTY of parking for us in the lot across the street. The website should answer most questions on how to get there, etc.

I think I'll plan on getting there before 11AM, probably with boat in tow from Lake Austin, so look for the BIG black Dodge RAM with the pretty white/black boat hooked on the back. If the boat isn't on it, you still can't miss the truck, it's got a large Triton Boats decal on the back window.