From Galveston Island State Park: Go back toward Galveston Island. After passing 53rd Street there will be an IHOP and the San Luis Hotel on the left. Sias Street will be between those two landmarks. Turn left onto Sias Street. Wind your way back to the Sea Turtle Facility.
From Houston: Take I-45 to Galveston Island. Go to 53rd Street turn right. At Avenue U turn left. At Sias Drive turn right and follow road to parking lot on the right.