Part I: http://www.alexinwanderland.com/2013...amazon-review/
Part II: http://www.alexinwanderland.com/2013...amazon-review/
There seems to be few reviews about Aqua Expeditions online so just to address a few questions I had before embarking:
1. I think the four day itinerary was perfect. Three days would have been too short and for me, seven days would have been a tad long to be completely disconnected from the world (and excursions may have become repetitive).
2. I brought $150 in total for tipping. There will be two boxes to put envelopes in (one for guides and one for crew). Unfortunately I don't remember the recommended breakdown but just bring small bills in anticipation.
3. I highly recommend spending some time in Iquitos before or after the cruise. It is a very interesting city -- well worth a day and night to explore before embarking!