Kevin, thanks for posting the Mesa Marin location info.
Eric, to give you an idea of the day, following is how it is generally done. Car pool from Mesa Marin, leave one or two cars in Wofford Heights (for later shuttles), park remaining cars/bikes/people at Rancheria Rd/Unal Trail Staging area, ride Unal -> Just Outstanding -> Old State Rd back to Wofford Heights, shuttle to collect cars at the top then off to the brewery for (most likely) a late lunch and Beer..... Final decisions are always made on the day based on weather, riders and available time.
While this is a predominately down hill ride 
there are some strenuos ups, most notably 3 miles with almost no shade leading to Old State Rd. Bring lots of food, drink and sunscreen for this.
James