Best time to visit: Spring - Fall
Lava Flow Campground
I went to Craters of the Moon after Yellowstone. I left Yellowstone thinking that it was bizarre, but, then I arrived at Craters of the Moon. It's so weird. There's a huge lava cone at the center of the park that you can climb to the top of. There's just lava rock everywhere. The geography of the land is nearly as bizarre as what is lying on top of it. I believe the park loop road is 13 miles, and it's a nice, lightly trafficked road with some decent hills for a nice bicycle ride. I highly reccomend taking your bike around the park and leave the car parked at the campground.