Hi Hank. First thing you should know is there is only 1 park and play hole capable of giving up loops in the state of Texas and it has not run at an appropriate level in 3 years.
cmowry (hey brother) is correct, Longhorn wave is the closet to Austin but they've not had the right gate config for nearly 2 years now so it's not been an option.
Your best bet is Rio Vista in San Marcos, though summer is pretty much off season because the river becomes congested with tubers except at night or early morning.
The Dallas WW park is officially open for business but it takes rain to get it going.
Great runs when we get lots of rain (we're currently in drought), planning a trip to Arkansas in Sept., etc., etc.
It's Summer, why aren't you on the Ocoee? Welcome to Texas. PM me your phone # and I'd be happy to show you around.