Great shaded trail, with amazing views & unusual flora. You could spend a few days just on the trail. See if you can get a better trail map than the free one as it is not always easy to tell where you are in the map. Map has some marker posts from trail. Marker posts are usually by a plant sign so I'm guessing there is a more detailed publication available.
IF YOU LOVE PLANTS, TREES, TRAILS THIS PLACE WILL BLOW YOU AWAY
Take road all the way to the top parking lot by the guest services for more info. $5 donation recommended but is worth much more