The first area we wanted to visit was the Experimental Breeder Reactor 1 (EBR-1) Museum approximately 18 miles east of Arco. That didn't happen as the museum is only open from Memorial to Labor Day each year. If you'd like more information on this one, take a look at this link.
Craters of the Moon National Monument and Preserve. There is only one entrance to this area off of Rt. 20/26/93, so it's pretty easy to find.
If you're ever in the area, a visit to this National Monument is definitely recommended. There are many more pictures of the C of M in our Google+ album.
We actually left the Arco, ID area today and headed to Park City, UT. Hopefully, I'll be a bit better with keeping up with our blogging activities in that area.