If you are coming from beyond the Bay Area look into Amtrak and Greyhound:

Amtrak
Take Amtrak to the San Jose Diridon station
http://www.amtrak.com 1-800-USA-RAIL
For a general map of routes click on "routes and services." Click on "West" for an enlargement.

Greyhound
Take Greyhound to Santa Cruz, or possibly San Jose. http://www.greyhound.com 1-800-231-2222
To get a general map of Greyhound routes click on "travel planning" and then on"route map."
Click on "West" for an enlargement.

In Santa Cruz, Greyhound stops next to the Metro bus center.
Take the 35 to Ben Lomond
Santa Cruz Metro, http://www.scmtd.com (831)425-8600.
(If you are coming from the north on a weekday, going down to Santa Cruz and then back up to Ben Lomond will add time to your trip. For this reason you may want to look into Amtrak or transfering to local buses in San Jose.)

Greyhound also stops in San Jose, however it is 0.8 miles from the San Jose Diridon station. To get a bus from Grayhound to Diridon you would need consult the VTA (the Santa Clara Valley Transit Authority). (408) 321-2300, also (800) 894-9908 http://www.vta.org

From the San Jose Diridon Station
Monday-Friday:
Take the 17 Express to the Scotts Valley Transit Center.
Take an outbound (not toward Santa Cruz) 35 bus to Ben Lomond. For more information about either bus contact Santa Cruz Metro, http://www.scmtd.com (831) 425-8600.

Saturday-Sunday
Take an Amtrack bus to Santa Cruz Metro Center.
Take a 35 bus to Ben Lomond.

At Ben Lomond
Get off the 35 at Hwy 9 and Main (across from Scarborough Lumber). There are pay phones outside of Henfling's Tavern and also in the Ben Lomond Market.