Alone with the wild Rio Grande(as part of post-9/11 rules that have drastically changed life along both sides of this stretch of river, passports will be required for these outings starting in June 2009).
We pull up on a sandy Mexican beach for lunch

Up ahead are more canyons, including the 126-mile designated Wild and Scenic River area, so remote that you travel at least six or seven days before there is any place to take out.
Now that would be an adventure.