Budget traveller

I'm looking at the cruises that go to the NW Passage and East Greenland. My dream vacation would be to cruise from Reykjavik to Kangerlussuaq to Nome. This is 35 days which seems rather long, but it would include both East Greenland and NW Passage. There are two shorter ones. One from Reykjavik to Kangerlussuaq, for 14 days which would only include East Greenland. The other is from Kangerlussuaq to Nome, for 21 days, which is just the NW Passage. Does anyone have any experience of these? Is one better than the other?

Has anyone done a cruise on the section of the Amazon between Manuas and Iquitos? What do you see here? Is it really worth it?

I've been on the Antarctic cruise with Seabourn and I loved the Zodiac excursions.i was just wondering what you would see on this.

Is the section of the Amazon cruise between Manaus and Iquitos worth it? What is there to see there?