From North: Take most convenient freeway to the 55 freeway. Exit at Chapman Ave EAST. Chapman ave turns into Santiago Canyon Road. Follow the road approximately 9 miles (from 55 freeway). You will pass Irvine Lake at park entrance (DO NOT turn into Irvine Lake). Make first left after Irvine Lake at park entrance. Follow the signs.
From South: Exit 5 Fwy north at El Toro Road - go right. El Toro Road turns into Santiago Canyon Road. Follow road 15.75 miles to park entrance on the right. If you reach Irvine Lake, you've gone too far. Make right turn at park entrance. Follow signs.