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View Our Trail Maps Whether you are planning to go to Ringtail Ridge Spring Lake Preserve or one of the other natural areas in San Marcos we have trail maps to help you navigate the trails. About SMGA The SMGA is working to protect the quality of life for the people of San Marcos through the creation of interconnected parks and greenbelts to protect natural areas for ourselves our children and our future. Join SMGA We are creating a legacy of conservation for the health and vitality of our community that we hope will last for centuries. You can support this effort by joining or making a donation to SMGA.