Log Cabin Wilderness Camp has the "Gateway Program" which lets your troop customize a week long backpacking trip to their needs or you can choose from 14 pre-planned treks. They also have a program called Mountain Man which is a more introductory course in wilderness and backpacking skills. It consists of low and high COPE, Rock Climbing (on real rock faces0, a couple nights of camping/backpacking, choice of 3 peaks to climb, and possibly ice/snow training (conditions permitting).
For more information check out their site at: http://www.logcabincamp.org
I mean, they are located in Yosemite, what more could you ask for?
just remember, location, location, location!!!
I think they also offer Venture Programs and will help you in achieving the Ranger Award.
Also I hear they are always looking for staff so check out the site.