san francisco: take a trip across the golden gate bridge and follow the road toward mount tam. you'll come across a small parking area before you get to the top that leads into the woods. follow a map down the steep, rocky paths to the bottom where you will be greeted by alpine lake. take note as you head downward that the hike back up will not be as fun.

san francisco: cross the golden gate bridge and drive up up and up into the marin headlands. as you wind along the roads, passing the stunning views, you will come to the former Nike Missile launch site at Fort Barry. take a moment to stare out at the missiles sunning themselves in the scene. do not climb the fence and attempt to "ride" them, no matter how tempting. it's just a bad idea.