I've posted the tour description below in case they remove it.
HOG ISLAND OYSTER CO. & STRAUS DAIRY
Thursday, August 14
Join local oystermen for a tour of an oyster-growing operation. Taste oysters fresh from Tomales Bay while enjoying great views. Eat your own lunch or pre-order a made-in-Marin lunch from Tomales Bay Foods with your registration. Afterwards, carpool to the Straus Dairy where dairyman Albert Straus will talk about his organic dairy operation. Learn about the methane digester and other energy-producing and -conserving techniques used at the ranch. Watch the cows being milked in the dairy that was converted to organic in 1993.
TIME: 11 A.M–3 P.M.
WHERE TO MEET: Hog Island Oyster Co., 20215 Highway One, Marshall (10 miles north of Point Reyes Station). Carpool to dairy from there.
WHAT TO BRING: Water, picnic, shoes that can get dirty
DEGREE OF DIFFICULTY: Easy
COST: $30 / $35 non-members ( $20 additional to pre-order made-in-Marin lunch.)