» Redwood Hikes Map for San Mateo County Memorial Park: An excellent quality map by Dave Baselt for free. Thanks Dave!
» Official Trail Map: Pretty good quality map showing all the trails.
» 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.
» Redwoodhikes Trail Map:
Great map showing many parks like Purisima Creek, Huddart, Wunderlich, El Corte De Madera, Foothills, Hidden Villa and Rancho San Antonio. Trail maps for individual parks are available online for free. However, the RedwoodHikes map shows the big picture and is helpful for planning hikes that go through multiple parks.
Mount Ellen Trail (0.8 miles) → Pomponio Trail (2.2 miles) → Mount Ellen Trail (0.3 miles).
A RedwoodHikes article describes a similar route in great detail. It starts from Hoffman Creek Trailhead and goes through campsites and paved roads. Another decription by Kevin Gong.