My wife and I are hoping to go to the Upper Amazon Basin and Machu Picchu in 2014. We are in our early 60's, like basic comforts (bathroom in the room), but are pretty adaptable and adventurous. Any suggestions would be appreciated. Anyone know anything about the La Esmeralda that has trips down the river? Or Explorama Lodges? Any recommendations for good tour companies for Machu Picchu? One recommendation I got was Dos Manos Peru. Any suggestions as to best time to go for weather, number of tourists, etc?