This link has trail descriptions and a map of the park. Also maps are available at the trail head.
Sawmill campsite is the only one down in the gorge and it easy to get to by every main trail head
I would say 90% of the time the rangers will stop by to check to see if you made it to the campsite you listed on your permit.
There are times that the only way you can do something is alone – that waiting on the convenience of others means that a lot of opportunities will pass you by
Religion was invented when the first con man met the first fool.” ― Mark Twain
Who cares about showers, gourmet food, using flush toilets. Just keep on walking and being away from it all.