(Our southwest trip started May 1. All of my posts were written as the trip went along but were not posted live until we returned. If you want to read all the posts related to the trip, click on "southwest" in the label section below).
I spent many months preparing for our trip to Arizona and New Mexico. I used the National Park Service web site extensively for information on the national parks and national monuments we planned to visit.
But the best web site I found for our trip was The American Southwest. Loaded with extensive and detailed information, I printed off many pages to bring along with us.
If you are planning a trip to any of the states covered by The American Southwest (Arizona, California, Colorado, Nevada, New Mexico, Texas, Utah, Wyoming) I highly recommend starting your research at this site.