Founded in 1955, the 115-acre Krause Springs in Spicewood, Texas (about 30 minutes outside of Austin) has become a classic stop for roadtrippers traveling around Texas Hill Country. It offers camping and swimming in their historic natural springs. The springs have been privately owned by the Krause family for over half a century, and the property is listed on the National Registry of Historical Sites.
It's opened year-round, pets are not allowed, and there's no lifeguard on duty. Also, credit cards aren't accepted so be sure to bring cash for the $7 adult admission fee ($5 for kids 4-11), and if you wanna camp it's $14 per adult, $6 per kid, and $14 for an RV spot.
I recently visited with my son, who was 10 months old at the time. We were roadtripping around Texas and spent about a week exploring Hill Country. It's such an incredible part of the state, I highly recommend visiting.
I'd heard of Krause Springs and decided to spend an afternoon there. To my amazement there were 32 springs on site, and several of them feed a man-made pool, which was quite beautiful. It was tucked into a lush forested area. The natural pool also flows into Lake Travis.
Not only does the property boast dozens of springs, but there are also camping sites as well. There's primitive camping and sites for 24 RVs, with water and electricity included for guests. And plenty of picnic areas with BBQ pits. You can also rent a burn barrel ring, to have your own DIY bonfire. They can be rented for $10 ($5 is refunded when you return it). There are also bathroom facilities on-site, with showers, toilets and faucets. It's open in the summer from 9AM to 9PM.