great hike. was a hot day but most of the trail is covered with few uncovered. the park can be closed in the morning and would need to park a mile away on the streets. the redwood trees at the base is a well come change up other hikes. we did the reverse hike- going up anticlockwise. turned out to be a good s decision since the hike down in Collier spring trail is steep and treacherous. the hike up is not extremely steep but it is relentless. the view from the top is well worth it. in summer months carry lots of water, you will need it. hike up is easier compared to way down. trail down is damaged by spring run off and is very slippery due to soft gravel. encountered a swarm of bees and got stung too. so watch for unexpected company. overall rewarding and similar to Mt. Diablo hike.