by AlmostThere » Tue Apr 26, 2011 1:19 pm
You can't sleep in cars inside the park. It'll have to be outside the park in national forest, in areas not posted "no trespassing" or "no parking." That's not going to be easy either, but there are spots along the road to Hetch Hetchy where you can sleep in pullouts.
Sleeping in a car in the park is risky - I've started night hikes at midnight and rangers come through the lots with flashlights.