To get to the lake, go IH10 West and exit Ranger Creek Road (past Boerne, Hwy 46 and John's Rd exit). Take a left under the highway and an immediate right.  Follow the access road on the left side of IH10 for 1 1/2 miles.  You will see a sign to Boerne City Lake on Upper Cibolo Creek Rd.  Take a left and follow Upper Cibolo for about 1/2 mile until you see the park entrance on your left.  Take a left into the park and follow the road to the first parking lot on your left (another 1/2 mile).