I will be visiting Yosemite in August and have secured reservations for 2 nights in the valley at a campsite in Upper Pines. We would like to extend the trip for 2 more nights and were thinking about doing so by attempting the first come/first served camping at Bridalveil Creek along Glacier Point Road. The NPS website states that Camp 4 and Tuolumne fill up rather quickly, but that the other first come/first served campsites tend to be "easier to find space in" if you arrive prior to noon. Since we will be coming from the valley and technically have a head start over "the masses", I am pretty sure we can get there way early. I have no experience with first come first served camping anywhere, let alone in a park like Yosemite. Does anyone have any experience with this campground in August, or any thoughts or recommendations in general? We would be looking at checking in for a Wednesday and Thursday night (not on the weekend). As always, thanks in advance for your input!