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From Austin, follow IH 35 South to San Marcos. Take the exit for Aquarena Springs Drive and at the light, merge right onto Aquarena Springs Drive/Loop 82. From San Antonio, take the exit for Aquarena Springs Drive and at the light, turn left onto Aquarena Springs Drive/Loop 82.

Follow Aquarena Springs Road past Bobcat Stadium, over the San Marcos River, and turn right onto University Drive.  Take the first right on Moon Street.  Stop at parking attendant booth for directions to visitor parking.  From visitor parking walk west to Edward Gary.  Turn right and walk north up Edward Gary.  Continue up the stairs next to Lampasas.  When you arrive at the top of the stairs, Old Main will be on your right, the Chemistry Building directly in front of you, and Centennial Hall just to your left next to the Chemistry Building.  Enter Centennial Hall through the doors facing the Chemistry building.  The College of Science Undergraduate Advising Center will be the first door on your right, Centennial Hall 202.