A collapsed-grotto swimming hole under a 50-foot waterfall — the most photographed natural pool in Texas.
Hamilton Pool is what happens when a Hill Country river decides to show off: thousands of years ago the dome of an underground river collapsed, leaving a jade-green pool inside a half-open grotto with a 50-foot waterfall pouring over the lip. It is, by some margin, the most photographed swimming hole in Texas.
It is also the most regulated. Reservations are mandatory every single day, sold as morning (9–12:30) or afternoon (2–5:30) windows — $12 per vehicle online, plus $8 per adult in cash at the gate. Swimming is never guaranteed: bacteria levels after rain close the water while the preserve stays open. The quarter-mile trail down is steep and rocky; real shoes required.
For wedding guests it's a half-day adventure that pairs naturally with the Dripping Springs venues — Camp Lucy and the Creek Road corridor are twenty minutes away. Send the able-bodied early-risers for the morning window, and have them check the swim status the day before so expectations match reality.