Been here a few times now.  We camp all the way down back next to the creek (which was stagnant).  It's definitely more peaceful and scenic than the other sites, but also places you as far away as you can be from any facilities if you need them.  From the site you can walk to the swimming hole which is cool. The walk over is a bit uneven so if you're not balanced you gotta be a little careful. The swimming hole is cool but gets crowded on hot days, particularly weekends, and when crowded it isn't always super clean due to shitty people.  They don't do reservations so you can just pull up early afternoon and camp for as long as you like. Overall, it's nice for a quick/last-minute escape from Austin, but I wouldn't make it a destination for a roadtrip or anything.