I frequently visit high malaria areas, (including a NYE on the Flotel Orellana which is where I suspect you are going?) and medics here have consistently told me that Larium is now the go. The old Chloriquin treatment is apparently something those cunning mozzies have grown resistant to. But DO take something.
To be honest I've been to the Amazon in Peru, Brazil and Ecuador and where we were was terribly disappointing. More different birds outside my office as I type this at sunset than I saw in a week there in Ecuador.
And DO take if time allows the "Devil's Nose" train ride down the Avenue Of The Volcanoes from Quito to the coast. The world's steepest and scariest!
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~ Glen ~