» Official Trail Map for Pescadero Creek County Park: Pretty good quality map showing all the trails.
» Official State Parks Map: A map showing all the trails but hard to read.
» Redwood Hikes Map: Annotated trail map of Portola Redwoods State Park and Pescadero Creek County Park, Second edition, 2008. This is an excellent map sold by Dave Baselt ($6.95 in Dec 2011). This map is useful for exploring a bunch of parks: Portola Redwoods, Pescadero Creek, Sam Macdonald.
» Redwood Hikes Map: Bay Area Trail Map: Saratoga to Big Basin, First edition, 2010. This is an excellent map sold by Dave Baselt ($6.95 in Dec 2011). This map is useful for exploring many parks in this area. Highly recommended for avid hikers.
Route in brief:
To Tarwater Trailhead: From Portola Redwoods Park HQ, find your way to Coyote Ridge Trail → Upper Coyote Ridge Trail to reach Tarwater Trailhead.
To Park HQ: Follow Tarwater Loop Trail → left on Pomponio Trail to reach Park HQ.
Notes: There are several intersections close to Park HQ, so a good trail map would be helpful.