We are going to be going through Yosemite and Sequoia NPs at the end of May. We are looking to find good campsites that are inexpensive (around $20/night) and close access to hiking trails and other good attractions.

Also, what's the best way to book a campsite?

Any suggestions would be greatly appreciated.

FYI, 5 of us are doing a 3-4 week camping trip around the US.

Thanks for your help,
Alex