Hi, Tony
The trail to LPL is not difficult unless you are WAY out of shape! It is 2.8 miles one way.
Log crossing: Flattened logs and easy to cross. Just be sure your proprioreceptors are working good. In other words, don't sweat it!
Camping at Lone Pine Lake: You can. No fires allowed on the MWT. Propane/white gas stoves allowed. You can fish there.
My wife and I will be in the area between July 25-29 at Site 44 with BruinDave, BruinJane and TeamBruin. We plan on taking a hike to LPL to do some flyfishing (catch and release). You are welcome to join us. Summit attempt July 28, 2010 if permit available for two.
Have fun.