Jgaisser; starting June 1, flipping out of New York City might be a good choice, it's easy to get to the trail from there, Amtrack has a stop on the AT
Carbo; A friend of mine actually completely tore his bicep ligament, I forget how long it took for him to heal, I'll guess 3 months or so he was back at 100% Be Well
Danger; When I was 25 and racing bicycles I was about 6-7% body fat, a point or 2 more than the other guys. When I got to 5% I felt real bad, lack of strength and endurance. You should be okay below 10%. Not sure how this changes at our ages. Carrying extra wt. to start with doesn't make sense. knees endurance etc. Extra cheese burgers in town, quart of chocolate milk, good ice cream.