We're beginning to plan for a 50 Miler next summer (June '04). One possibility is Yosemite, perhaps starting in Yosemite Village, perhaps at Tuolomne Meadows, perhaps at Glacier Point. It looks, for example, like a nice hike could begin in the Village, head northeast, and loop around for a return down the Yosemite Falls trail.
There are innumerable other possibilities, including the John Muir Trail, starting from Glacier Point, beginning at Hetch Hetchy, etc., etc.
I'm sure many have any experience in planning a 50 Miler with a route like this: I'd appreciate being able to benefit from that experience!
- Alan