Wow! Thanks for all the responses, especially the detail you provided, Don. I'll be getting out the map tonight and plotting where all these places are. I have about three weeks, starting in about three weeks from now, so will heed the advice about snow on the North Rim, etc. And thanks for alerting me to Desert Solataire, Lee. I read a lot, so that's the sort of tip that is really useful. Thanks again to everyone.