We need some advice . . . We would like to take a short, one or two week driving trip from and back to Merida in late March. Would like to see mountains, do some horseback riding through the mountains and see some historic cities (Oaxaca?). OR . . . we are thinking of flying to Chihuahua and taking the Copper Canyon train trip. Any thoughts or ideas on either trip? Where to go from Merida? Is the Copper Canyon area safe right now? Any suggestions for tour operators there. Want to do Copper Canyon train trip plus stay in area a few days for horseback riding through mountains. Any and all suggestions are welcome. BTW, we are in our mid-60s and of average fitness for people that age, though we do have time to work on that. Thanks.