Ditto + @ti2d
#1 : From what I know (less than some, more than others) you can leave around 10:00 or so, planning on entering the Whitney Zone around 12:00. Take your time. Yes, permits "may" get checked.
#2 : Usually there is parking. I would try to get there in the morning the day before you hike and get a spot. Talk to the locals and other hikers and especially DOUG at the Portal Store.
**** IMPORTANT **** DO NOT LEAVE ANYTHING IN YOUR VEHICLE THAT LOOKS LIKE FOOD, WATER, ETC. NOT EVEN SUNSCREEN, BAGS OR CONTAINERS!!!! BEARS WILL FIND A WAY IN AND THEY WILL EAT ANYTHING.
I've seen lots of bears in the parking lot, camping areas, etc. They are not shy. They will find your food wherever it is. Per above: DO NOT Leave food in a campsite and do not leave your pack more than 5 feet away. I have had a bear come within 6 or so feet of me at 2:00 A.M. and not even know it until someone told me.
#3 : Rattlesnakes, NO. Bears, YES, Marmots, YES, Mice, YES. Be Very careful of the Grouse.....they will attack (just ask Laura :-0)
#4 : I prefer to camp at the Portal.
Most of all, take your time and enjoy the hike. It can be brutal, but it is certainly a great experience. And, bring your camera. Lots of luck.
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