Here goes...
1. 1 vs. 2 days...How about 3 days. Personally, I find the day hike rushed. I hike a day up to Trail Camp, a summit day and an out day. Figuring you are going have to drive back to SoCal when your last day is done.
2. Shape...Very good shape for the day hike. The better shape you are in, the more enjoyable the hike will be. For backpacking, all you need to do is get in good enough shape to haul 30# 6 miles, +3,600'. Getting to the summit with a light pack is a semi-piece of cake..
3. Getting into shape...Work harder than you think you need to, no matter day hike or backpack. San Antonio Canyon is a great place to train because you can cobble together almost any gain, distance or terrain.
4. 6 to 10 peeps...smaller groups work better. It's easier to win a lottery spot or to get a walk-in. To maximize your chance of a permit, structure you application with a preference for a mid week start.
