This locally-owned San Marcos coffee shop is known for unique Oak Roasted Coffee and signature sweet cream Moon Milk. Summer Moon San Marcos is located in Springtown Center, just off I-35. This location is minutes away from Texas State University, San Marcos river tubing and downtown San Marcos. A kid-friendly favorite for locals and students, Summer Moon San Marcos features online ordering, free wi-fi, and pet-friendly patio seating.