The Skyline-to-the-Sea Trail is a 25-mile route in Big Basin Redwoods State Park, from the Waddell Creek TH to the Saratoga Gap TH.
Two races use the Skyline-to-the-Sea Trail for marathon and 50km races. In the www.pctrailruns.com events, marathon course records are Daniel Cono, 3h13m06s, 10/7/2017, and Linden Bader, 3h36m00s, 4/10/2011, and course records in the 50km are Leor Pantilat in 3h24m09s, 4/10/2011, and Caitlin Smith, 4h00m48s, 4/18/2010. Pantilat's 50km CR translates to well under 3hr for the 25-mile route. www.coastaltrailruns.com also put on races on this route, with a marathon CRs by Jussi Utriainen, 3h00m47s, 6/9/2013, and Paulina Utriainen, 3h28m27s, 6/9/2013.
The Skyline-to-the-Sea Trail is one of the most popular backpacking routes in the Bay Area. The hike is usually done in three days, each with better scenery than the last. The first day's hike starts in Castle Rock State Park at Saratoga Gap and descends alongside busy Highway 9 to Waterman Gap. On the second day, the trail leaves Highway 9 behind and enters Big Basin Redwoods State Park, descending into an outstanding old-growth redwood grove and ending at Jay Camp, near the park headquarters. The final day of hiking is by far the best, descending through wilderness old growth, passing by Berry Creek Falls, and ending at Waddell Beach.For our purposes, we will record non-race FKTs covering the exact route of the Skyline-to-the-Sea Trail, one way and out & back.
The trail is usually said to be about 30 miles long, but my GPS puts it at 25 miles. However, side trips to Berry Creek Falls, the redwood loop, and Jay Camp will add a few more miles.
The Skyline-to-the-Sea Trail can be impassable after winter rains (especially at the stream crossing just after Berry Creek Falls; unfortunately there's no easy detour if the bridge is out) and closed due to summer forest fires. Trail closures aren't posted online or at the trailheads, so the only way to find out about trail conditions is to call or visit the park office (831-338-8860).
As a point-to-point route, the Skyline-to-the-Sea Duathlon (submitted by Will Harmon) makes sense. Bike from one TH to the other by any route, and run back (or vice versa). For the biking portion (48-49 miles) Google Maps recommends taking (from Saratoga Gap) CA-35 to CA-84 through San Gregorio, south on Stage Road to Pescadero Creek Road, then Cloverdale Road to Gazos Creek Road then CA-1.