If you are interested in riding a ZipLine through the redwood canopy in the Santa Cruz Mountains, may I suggest the Mt. Hermon Redwood Canopy Tours.
Reservations are required, and can be made either through their website (above) or by calling 831-430-4357.
The price is $80.00 per person, and they offer discounts for groups of 8 or more.
They are located at 17 Conference Drive, Mount Hermon, CA 95041
This is located just 30 minutes from San Jose and 1 hour from San Francisco.
Have fun and be prepared to be thrilled!