You'll need a discover pass to park at the trailhead (and many others in the region). A day pass is $10, but I recommend buying the annual pass for $30.
Rating:

A light slope up the entire way

Some other bikers

Passed by some rocker climbers. The walls have attach points making it easy for anyone with gear to come and scale the walls!

Throughout the trip you will cross many trestle bridges constructed by the railroad companies.