Hiked the southern Lost Coast Trail (Sinkyone Wilderness) with my son in early July 2018. Stared at Hidden Valley, out at Usal beach 3 days and 3 nights on the trail. Many beautiful sections on the trail, especially the tracks through the redwoods and near the coast (jones beach to bear harbor especially.) Sections through the dry, exposed tall grass and scrub sections were VERY challenging. Impossible without poles. Trail has collapsed in many sections. Lots of trees across the trail in higher sections. Lower sections overgrown with nettles & thorns. No trail maintenance in many years. Recommend long pants and long sleeves and gloves and boot traction covers (seriously!). Sinkyone VERY different from Kings Range section. Multiple 1000 ft plus elevation gains and losses. More time in the redwoods, very little on the beach. But ample rewards for the adventurous and prepared! Relatively few hikers on the trail. No problem finding nice campsites at backcountry sites. No problem with water at stream crossings. Lots of Elk, especially at Jones beach. No evidence of bears.
In summary, a challenging AND rewarding hike. Not for newbies or unprepared. 3 full days recommended for full southern section.