We spent the day on Gil's Meeting of the Waters excursion when our ship was docked in Santarem and it was the highlight of our three weeks in Brazil. The actual Meeting of the Waters in Santarem was not as impressive as in Manaus due to the low water level at the end of the dry season but it was the rest of the day that was so interesting. Gil is an extremely knowledgeable lifelong resident of the area and knows it inside and out. You were be taught, fed, and entertained. Highly recommend.