by AlmostThere » Tue Jul 27, 2010 7:33 am
There is a maximum on any wilderness permit of 2 weeks. You are supposed to put your predicted itinerary on to facilitate any search and rescue operation that may occur, ie, it will help them help you to be pretty close to what you actually do, if you get lost, but the fixed points that are nonnegotiable are the starting date and starting trailhead. If either of those changes you need a new permit.
You would have to ask the rangers about the part about crossing roads - that's technically exiting the wilderness. People will try to bend rules by getting a permit heading to May Lake and then wandering on over and down Lyell on the JMT... not really what should be happening. I suspect they will say that you need a separate permit.
There is no camping between Mono and LYV.
You should start where your permit says to start and hike where you planned to go, unless you get another permit walk in. If you go try for a walk in from Happy Isles, Sunrise, Cathedral, or any other major popular trailhead.... you should show up very early in the morning (the closer to a weekend you are, the earlier you go) and plan to sit on the porch until the wilderness office opens. You will be getting a permit for the following day. You need to be at the wilderness office that has control over the area you want to hike in - Happy Isles you will be in the valley at the wilderness center, anything off Tioga Rd you will be in Tuolumne Meadows.
If you have never been in Yosemite, and you can get a walk in for the route, I suggest hitting the high points - get the permit and spend your time waiting for the next day's start in the valley, riding shuttles and walking around. Spend the night in the backpacker camp behind Upper Pines campground. Hike the Mist Trail to LYV or beyond. Go to half dome or clouds rest (clouds has a better view and you won't get heat stroke waiting in line for the cables). Hike up to Sunrise Lakes or Cathedral Lakes. You can spend a couple nights on the trail, wherever you like, once you are beyond LYV which is heavily regulated and patrolled. (Review the rules on the Yose website about staying 100 feet from water, 50 feet off trail, digging six inches down, packing out your used TP... etc.) Spend some time in Tuolumne Meadows hiking around, maybe even spend that last night in the backpacker campground that your permit entitles you to do, have a burger at the grill, then catch the backpacker bus or YARTS back to the valley to your car.