Just just recently got back from an one of a kind mountain bike trip out to the Northen Jungles of Peten, Guatemala. Our idea was to be the first to ride the famous Carmelita to El Mirador trail. This trail has long existed, infact it dates back to the Mayan pre-classic period and follows much of the original Mayan Sakbe or Mayan highway from Carmelita to the ruins themselves.
We didnt really take into account the heat and humidity into our calculations of effort and time needed to make it to Mirador. It is totally do-able in a day. But you need to be prepared to have access to a LOT of water. Upon planning the trip everyone that we spoke with out in Carmelita tod us that it was going to be hard going and hot but at the very least that it was dry. What no one told us was that it would be potentially better to go a little later in the season. They had gotten a lot of late season rain which with all the mule train traffic had created this lunar hardened mud post hole effect that was like riding through a 43 km. boulder field in 35* heat and 90% humidity.