You need to book in advance . And they do only tours. You cant go on your own.
It's a guided tour, with a ticket. No self touring allowed. They do have a walking trail, that's not mysterious and is free to walk at your leisure amongst the beautiful redwoods.
Havr to buy a ticket call and make a reservation
No, visiting is only with scheduled tour and tour guide. However you could walk out after 30 min. If time is the constraint.
If your question is can you visit the mystery spot without other groups also being there as a tour no. It was will only be shown as a tour with other people.
Thanks! Your answer is awaiting moderation.