From Trippet Ranch, head south and when you get to a T-intersection of Eagle Rock Fire Road and East Topanga Fire Road, turn right and start climbing.
You'll be mostly climbing until you reach the Parker Mesa Overlook
trail, which is a good place to stop and admire the beautiful view of the pacific ocean and the channel islands. After this overlook, the trail starts a long descent, which won't end until you reach the Paseo Miramar Trailhead.
The fire road is wide and packed, in a very good condition all year long. You'll encounter cyclists, hikers and horseback riders, so please be courteous to your fellow trail users!