Hi. I'm planning a John Muir Trail thru hike, N to S, this summer. I *thought* I'd read somewhere about a reservations-only bus (or maybe "jitney" is more appropriate) that I could use to get from Whitney Portal back up north somewhere -- preferably Yosemite Valley, but Lee Vining, etc., would be OK. Did I make this up? What do other people do? I'll have a young teenager with me, so I would just as soon not try hitchiking.