This is a casual 3-hour drive through the Santa Cruz Mountains (starting in Los Gatos at 10:00AM) followed by a tour of the Military Vehicle Technology Foundation in Portola Valley, the largest private collection of military vehicles in the US.

http://www.milvehtechfound.com/

This tour is limited to BMW CCA members (or associate members) only due to the small number of people (25).  No guests allowed.