Join us on a guided eco tour of the beautiful san marcos river the river is home to some of the cleanest water around fed by hundreds of springs that bubble up in the citys centre the river remains a constant 72 degrees making it a year round destination for fun your adventure starts 15 miles down river away from the hussle and bussle on a private stretch of the san marcos here your guide will navigate you through this beautiful area as you experience hidden texas at its best