I've been backpacking since Boy Scouts. I can't believe the torture racks us 80 pound guys carried 60 pounds of heavy gear and canned food in! Now that I'm 60, ultralight is the only thing that keeps me submitting peaks and running ridges. That and the hot springs where I usually base camp.
I started going south for the winter in 1984, and spent a total of 3 years in Mexico and 2 in Guatemala. I know about 70 miles of the 750-mile Copper Canyons. I mountain biked from Bisbee, Arizona to Lake Atitlan in Guatemala, 1988-9. I almost summited Orizaba, the highest peak in Mexico at about 18,600', but had been injured previously and so wasn't in good shape. Several of us built a log raft and navigated the flatter parts of the Jatate, Lacuntun and Ucimacinta rivers, for 8 days.
I backpacked 300 miles of the Continental Divide and Colorado Trails, from my home in Boulder to Salida, in 2001. I've spent half of each summer at Conundrum hot springs since then. It's the highest in N. America at 11,250'