El Chepe
It will probably be cold in January, at least on the canyon rim. We went in November several years ago and it snowed up top while it was like summer on the canyon floor.
Things have probably modernized since we were there, but communication was difficult at the time so we made our arrangements through California Native, who have guides in the canyon all the time and could deal with the lack of phones, computers, and the like.
We spent a couple of weeks in and around the canyon; if you would like some details send me an email.
Keith
ps: El Fuerte is a good recommendation.
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