For those who don't know Windy Point has a public and a private side. On the lake they are right next door to each other so the terrain underwater is very similar. When you turn left off commanche trail you can take the left fork to get to the public side. The entrance to the private side is to the right.
The public side is the LCRA side and is called Bob Wentz. There isn't as far as I can tell a real emphasis on SCUBA there. In addition to the cliff side which is similar to Barstows the LCRA side has a shallow area also. This seems to attract lots of families with young swimmers and picnickers. But there are a few interesting things under the water there. They used to have a platform but I haven't seen it recently. There are also some grottos that can hold quite a bit of air. They also used to have some silly tombstones but they weren't that deep and that was about 10 years ago so I don't know if they are still there. I just got back into SCUBA myself and last weekend was the first time in years that I've dived that side so I'm kind of eager to see what it's like now. That was when we found the Scoreboard (Deepwaterferet knew it was there).
The private side is called Barstows. It is primarily there for SCUBA. A lot of Shops do checkout dives there. Rich also maintains a lot of the underwater attractions there so there are quite a bit more things to see. Also Rich has a pretty good map to them. He also has a tank refilling station, snack bar, showers, and Wireless Internet!!! There are three or four sets of stairs down to the lake there as well (two of them reach the water even when the lake is down.
Both have bathrooms, changing stations, and I think they both have camping. The private side used to be a little more but I think they are both $10 for a day pass. I live in Austin and have a boat so I get a year pass to the LCRA parks that gets me in at Mansfield, Windy Point, and other Parks on Lake Travis and Lake Austin.
Sorry so long I guess I got a little chatty.