Alan, I sure wish I could join you but it's a busy time of year.
There are two separate lagoons, #1 is the larger and older one, #2 is used mainly by classes. But that is not a "rule" and you'll find classes and pleasure divers in both.
It used to be a limestone quarry and so the high alkalinity means there is no plant or fish life, although there are these shrimp-like things that hop along the bottom. But there are numerous sunken boats to see as well as platforms. Buoys mark most of them.
The biggest weather problem is rain, the runoff can stir up the silt. But it's not an especially silty lake so the viz is usually pretty good. Sometimes as poor as 5', but usually 15' to 25'. Some claim to have gotten 40'. There have been times where I've seen #1 have 5' and #2 have 25', and vice versa, so if you don't have good vis on your first dive, go try the other one. Wind isn't a problem. Expect water temps around 60. Are you diving dry or wet?
It's a pretty area with tall wooded forests, a nice place to camp overnight. If I recall, there are a few entry platforms in #1 but most people walk in. There are numerous "beaches" where you walk in to 3', put on your fins (or BC/tank), and back swim to where it drops off a bit. Really easy in and out. Nothing like your recent rappelling entry.
There are lots of covered picnic tables and you'll probably have your pick this time of year. Admission is $15 and air fills are $5, don't know if they give DMs any break or not.
It's real easy to get to. From I45 take exit 123, go east 4 miles, and it's on your left. The first two miles is decent asphalt, then it gets rougher with potholes. Go slow. BL is the only thing on the road (once you get to the rough part) so you can't miss it. Inside BL, the roads are gravel with ruts and holes, so drive real slow.