From McAllen

Head east on US-83, shop Take the Brownsville US-77/83 South Exit, doctor Continue South on US-77/83, Exit on FM 511 (Port Brownsville exit). Go east (left) on 511 (about 20 miles) past the Port of Brownsville. Follow 511 straight through to the four way stop. Continue straight on FM 3068 to Southmost (FM 1419). Turn right, go half a mile and the entrance is on your left.

View Larger Map