Buck rock is fun. Not much of a challenge though. I like 13S05. We call it Camp 7 rd. It follows the path of the Hume Bennet lumber companies railroad. It goes out along the edge of the canyon, and the veiws are spectacular. There are some places where the railroad ties are still visable. If you start at the Hume lake end, and follow it to the very end, you can see some parts of the old rail trussle, and wood stacked to feed the engines. Also, at the very end of the trail there is a Donkey Engine (winch) left from the lumber operation. It must be accesed on foot however. The road also passes through two named giant sequioa groves. The brush is tight in many places, the wheeling is not challangeing, I would download the MVUM. There is also a trail starting at Cherry gap. And if you are into waterfalls and swimming holes, there is an awesome one in the canyon no 4x4 required for that though but you have to cross the Kings river so in early season you must be a strong swimmer.
None of this is extreme wheeling, and please stay on the trail.