From LAHC area, allow a little over an hour.
Take 110N to 405N to 10 West, which turns into Highway 1, PCH.  Drive to Malibu, and just past the city center, turn right on Malibu Canyon Road. To get to the trailhead: Take Malibu Canyon Road to the intersection with Mulholland Highway, 6.3 miles from the coast. Turn west (left) at the light on Mulhollad Highway and drive 0.15 mile to the trailhead on the left. There is street parking on the both sides of the road.

Grassland Trail trailhead address: 27000 Mulholland Highway, Agoura Hills, CA 91301
Trailhead coordinates: 34.103394, -118.713806 (34° 06′ 12.21″N 118° 42′
49.70″W)Malibu Creek State Park map
Field trip will include a stop at Santa Monica Mountains Visitors’ Center at King Gillette Ranch on your way home, 26800 Mulholland Hwy, Calabasas, CA 91302, to learn from  exhibits. Malibu Creek Visitors’ Center is open 12-4 weekends.

Melanie Renfrew swimming, Century Lake MCSP, Earth Day field trip 2012