Sorry to be dumb, is "road side geology" a book?. We definitely needed something extra -- the only factoid I learned the whole trip was a casual comment about glaciers from another tourist.

And how DO you pick a tour company? I picked Timberline, and was vowing never to use them again. But I now realize they do have the benefit of being a known entity -- I'd know what to expect if I used them again. And on my to-do list is to take a bike trip every year...

Kim