John,
take a look over at
http://yosemitenews.info/forum/list.php?3 and ask away....there are some real experts over there (Bill-e-g goes to Yosemite every weekend rain-shine-snow-flood...he is there now) They will give you some wonderful tips on what to do and where.

The body betrays and the weather conspires, hopefully, not on the same day.