A sign informs Memorial Day visitors to Prince Solms Park in New Braunfels, Texas, on May 28, 2012, what is acceptable for tubers to carry down the Comal River. (Associated Press/San Antonio Express-News)

Photo by: John Davenport

A sign informs Memorial Day visitors to Prince Solms Park in New Braunfels, Texas, on May 28, 2012, what is acceptable for tubers to carry down the Comal River. (Associated Press/San Antonio Express-News)