Honestly Tam is garbage. Steer clear of Troop 80, this trail will ruin anyones day. Other than that, no real reccomondations. Try to go on the weekends so you can avoid the weekday warriors, no one really works in Marin so weekdays are real busy. From 101, get off at W. Blithedale exit, W. Blithedale ends at the entrance.
Whole area is pretty good.
At top, you take a different trail down that is very rocky and fast. It's A good 5 miles of this descending back to where you started from. I would go there more often if I didn't live so far away. East Peak ascent out of San Anselmo. Take Sir Francis Drake west, left turn on to Lagunitas.