I should have answered Jim's original question...
Backcountry trash and the lack of ranger presence comes to mind first. I've found and packed out lots of trash and have had to leave some behind (example: soaking wet 20x20 tarp full gallon coleman fuel containers). I attribute this to the occasional back country camper being in over his or head and thinking that the park fairy will clean up their mess. Seems to be an over all lack of common sense by a high percentage of visitors.
Also Seems like there are lots more motorcycles and loud pipes in the warmer months.
jasonkelkins at yahoo dot com