Devil's Backbone Trail
Difficult
https://www.toyota-4runner.org/nor-cal/247256-humboldt-lost-coast-surrounding-areas-thread-3.html
Closed in the wet season.
"Mildly tricky because it has some significant hills and the trail curves through tight trees on at least one of the downhills; with any traction loss you risk sliding and hitting a tree. There's a couple spots where you need 4LO and good clearance and approach / departure angle as you enter washes at a perpendicular."