Rainbow canyon

Is it worth a six hour drive?

Depends what you're looking for in a destination. I personally love the place, but it's only 1h40m from Vegas using the shortcut. It has awesome free camping in the cottonwoods. You'll probably be the only ones out there as well and the climbing has a 50' approach.

Some of the trad climbing scares me out there though, since the insides of the cracks are hollow sounding at various places. There are definitely some sweet lines though.

The sport climbing is pretty fun as well. The climbs tend to be steep and sustained with some of the bolts a little spaced, but still safe.