Get out of the city for one of the last weekends before holiday madness ensues.
Nicasio is worth visiting for it's almost unbelieveable bucolic charm that few towns still possess (Nicasio actually means "the hidden one"). However, it's current draw, Rancho Nicasio, also has quite the weekend of music lined up.
Mt. Tam is a majestic place during the day, but it's equally marvelous at night away from the city lights. Instead of holing up in a dark movie theater watching Gravity (overrated, I must say, even in 3D), experience space for real with an evening astronomy talk at the super cool and crumbling Mountain Theater.
Need something to do this weekend while everyone else is drinking $9 tall cans at Treasure Island Music Festival? You too, can get out of the city. Just take a brisk drive over the Golden Gate or a ferry ride to see what's happening in Marin.