And that's how we ended up at Cataract Falls trail in Marin. (Thanks Kim!)
But of course, before we left, Sak packed a backpack full of matches, dryer lint, flashlights, water and a can of spam. I did tell him it was an actual trail we'd be walking on, to which he said we might fall off the trail.
It was a decent hike, plenty of stairs for the vertical portions, so I don't think you'd need to bring your mountain-expedition gear. :P Lots of dogs on the trail. And lots of photographers lugging their giant tripods up. Just stay out of the water, cause it's drinking water.
On the way home, Sak took the coastal route, and I'm pretty sure we were driving somewhere we shouldn't have been because on the way down the mountain the road wasn't all paved. Adventure!