When tubing the San Marcos River in 2026, the key is to prioritize sun protection and foot safety. You should wear a swimsuit or quick-dry athletic wear; avoid denim or heavy cotton, as they become heavy and chafe when wet. Water shoes or sandals with a heel strap (like Chacos or Tevas) are absolutely essential, as the riverbed is rocky and slippery; flip-flops are notoriously lost to the current within the first five minutes. A wide-brimmed hat and polarized sunglasses (secured with a strap like Croakies) will protect you from the intense Texas sun. It is also highly recommended to wear a long-sleeved rash guard if you have fair skin, as you will be exposed for 3 to 7 hours depending on the water flow. Don't forget to apply water-resistant sunscreen to the tops of your thighs and feet, as these areas are most exposed while sitting in the tube. Many locals also wear a "waterproof pouch" around their necks for their ID and keys. If you plan to stop at the "Lions Club" or other local spots, having a dry shirt or cover-up in a dry bag is a smart move for when you finish your float.