The bus drops you off at the corner of Hwy. 1 and Almante, a couple hundred yards from the turn-off for Tennessee Valley Road. From there, you've got about a one-mile walk to the trailhead. Obviously, going via public trans is an all day adventure. Just stay on the wide trails.
Single track is for hikers only.
Bring sun protection. There's no shade. Regarding Rover, my friend, Jason, and I were stopped and almost fined by park police because Jason's dog was not on a leash. Since the first section of the Tennessee Valley Trail is paved, it's accessible to wheelchairs and strollers. The only thing is that you don't get ocean views at that point.