Let's head up to Feather Falls in Plumas Nat'l forest for an overnight hang: Saturday March 31st, 2012 to Sunday April 1st.
It's an 8 mile round trip to the falls, very much downhill on the way in but not so much on the way out (a loop hike with two pigtails).
This site (about waterfalls) gives a pretty fair overview of the falls and the hike.
My trip report from last year
I was the only hanger on that trip.