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San Marcos sits on I-35 in the Texas Hill County, about 40 minutes southeast of state capital Austin. San Antonio is also pretty convenient to San Marcos. Head about an hour southeast on I-35 to reach it.
The clean, warm San Marcos River provides plenty of options for water recreation right in the city. Head to Rio Vista Park for particularly fun tubing or kayaking. Rio Vista Falls Dam is the area's centerpiece. Shoot the rapids and get extreme with a trip over the falls!
Keep in mind that Texas summers get very hot. You'll be dealing with temperatures in the mid-90s from June to September. Aim for spring if that doesn't sound like a good time to you! From March to May, highs average a more comfortable 80 degrees or so.