San Marcos River
The river that made the city runs through town. There are many parks and restaurants along the river, and it's pretty much impossible to see any of San Marcos without seeing a lot of the river.
Blanco River
Joins the San Marcos a few miles down stream. It's not as big or visited as the San Marcos.
Movies in the Park
Every other Monday in June and July, by Parks and Recreation
Rio Vista Park
When the old dam was nearing collapse, the city decided to replace it with an artificial whitewater course. The new addition to the park has made it tremendously popular with swimmers, tubers, and boaters alike. There are also rope swings, good picnic areas, and a great playground just up the river.
Aquarena Center - Texas State University
Nature center, springs, wetlands, glass bottomed boats.
Texas Water Safari
A marathon boat race down the San Marcos and Guadalupe rivers. It begins at Aquarena Springs at 10 AM the second saturday of June and passes several local river crossings within a few hours.
Sights And Sounds of Christmas
An annual Christmas festival that takes place on the first weekend of December. Thursday, Friday, and Saturday night. Lots of booths for food and local art. Also performances by local school children and dance schools.