I was in the Amazon in April 2010 and my tour was truly unforgettable! I arranged everything with Max from www.maiaexpeditions.com. and he took such great care of me! Since I was traveling alone a lot of tour companies turned me down, or told me that things were not possible. Max went out of his way to organize everything that I wanted to do, and even though I was the only one on the tour he still arranged it!
Besides this, I was able to stay with a family on the water, swim with the dolphins, and climb a tree 35 meters high! The food was amazing and everyone was very nice and helpful, even when I didn't speak their language. The entire operation was professional and the English speaking guides were not only perfect in their English, but informative about the area, the people, and the animals.
I definitely recommend this company, and their guides!! Feel free to PM me if you have any questions or concerns about going there.