If you get into one of the big parks in the 'valley' you'll probably be talking to folks who are going to do a day trip to nearby Progresso Mexico. Ask them if you...and your wife...can tag along to observe the 'know hows' of crossing the border. Have a nice lunch and a margarita, shop a little, buy some medications if you need them and you'll have a great day. I can guarantee that your new friends will welcome you along. Then you can both see for yourselves that Progresso is a lively, fun town where you'll also see thousands of fellow 'valley' RVers visiting. It's absolutely safe.