I plan to arrive in Fresno Sept 26. I will use Amtrak to the Yosemite Bug into & out of the park. I'll be without a car, and I hear the bus service is limited at that time.

Will I be able to get down to Sequoia/Kings Nat. Park for a couple of days?
Can I camp there if I'm just backpacking?

Will it suck to get around the outer areas of Yosemite?

Is it realistic to hitch to some of these places outside Yosemite Valley?