I'm interested in the consevation lakes too. It's mostly the reason I joined this forum. Saw pics of bass posted on Fishbrain referring to the conservation lakes and would like to learn where they are, access, permit required, etc.
I couldn't find anything specifically for conservation but I did find a list of lots of parks, many in SA which might show you some places you never heard of. I live near 35 N. and O'Connor and Converse North Park is popular in this area. Also there is a nice pond at the corner of Walzem and 78 right behind the What-a-Burger. http://www.wildtexas.com/parks/results.php?nearby_cities=San+Antonio