Yes, the dress code is Cocktail Attire.
The shuttle to and from the ceremony will be leaving from a parking lot next to The Lodge at Tiburon (Tiburon Parking Lot C). If you are not staying at the Lodge, you can park in the lot from which the shuttle leaves for $2.50/hr. Alternatively, Tiburon Parking Lot A (across the street behind Chase Bank) is $5/day.