Braunig Lake RV Resort is 6 miles south of downtown Alamo on Highway 37. If you get a premium site you will really enjoy your stay. The standard sites are rather close together, but for site seeing it is doable. It is a Passport America park so you rates are half price. We stayed there twice in the past year and enjoyed both times. The Passport America rates are full time, no limit. Pay by the week. The second week is cheaper because you don't have to pay the taxes after your initial stay.
Traffic in downtown SA is really not that bad. Behind the Alamo is a parking lot, about 1 block away and cost $10 for the day. You walk to the Alamo and after your self tour there you walk across the street, down the stairs and you are on the Famed River Walk. Take the boat tour - you can't miss it. It's not expensive. The Alamo is the 5th Mission. Go on a POV self tour of the San Antonio missions. Some good history and photo ops. The church's in the missions are still operating.
Another one is Admiralty RV Resort. It is a very nice CG, but a little pricey. It is further away from down town but right next to Sea World. There is shuttle service but I don't know where it goes as we always used the POV.
I have heard that Green Tree Village RV Resort is nice, but I have no first hand experience.
If you don't mind day trips, try staying around New Braunfels. Look at the Rio Raft campground in Satler, TX. It is also full time PA. It is located at the 4th Landing. The rent tubes and will take you up-stream and you can tube back to the landing. The CG is on River Road just off of Highway 306. Make the trip down River Road to San Marcos, and visit the town. You are also only a few miles from Canyon Lake. Lots to do around the area for site seeing and shopping.
It is 50 miles to Austin, 50 miles to San Antonio, 20 mlies to a large Factory Outlet Mall, and on the way back stop at Camping World for your "want to have," RV stuff. There are many Other CG's in and around New Braunfels.
Have a nice trip.
Wayne MSGT USMC (Ret) & Earlene (CinCHouse)
2008 Winnebago Destination 39W
It is what it is, and then it is what you make of it.