Of course, you could always do the snowbird thing and head south to warmer climate. In order to power your air conditioner you will need to be plugged into o a powerful generator. So consider starting small, experiment, learn and make improvements when you can. There are a lot of free campgrounds and public land in the western states to camp, but not as much in the Eastern U. United States. If you don't like it, write to your congresspeople, write to the Yosemite management. If you are adequately prepared, then boondocking is not only a great way how to save money on camping fees, but it also opens a whole lot new world of freedom and scenic beauty.
If you are running air conditioner you may not be able to run any other electrical devices unless you have a very large generator.
Dealing with no RV hookups - Yosemite National Park Forum
Jan 23, can you run the propane to heat the rv with out being hooked up by: We've found countless other free services at visitor centers, town parks, community centers, and service stations - they're all listed in my Frugal Shunpiker's Guides. Other RVer's, claim that traveling with the propane on is a disaster waiting to happen. All you need is just a small basin of water, washcloth and soap. So let us talk about the water. An accident that breaks your tank connection could cause a massive explosion.