Keep San Marcos Beautiful Hot Spot Clean Up takes place on the first Saturday of each month. These short clean ups target a specific area along the river or at nearby creeks that flow into the river. Litter in the river, besides being unsightly, can also poison fish and other aquatic creatures that may mistake it for food. Hot Spot Clean Ups are organized by Keep San Marcos Beautiful and the Habitat Conservation Plan. Sign up to find out where each month’s Hot Spot will be. Every little bit counts! KSMB Hot Spots