Skip the main port chaos and book the Belén river tour to actually understand how this city breathes on water. You will see stilt houses, local markets selling everything from Amazonian fish to medicinal barks, and the contrast between the dry and wet seasons. Spend at least three hours here; it is intense and chaotic. Bring bug spray and cash for local snacks. Do not expect a luxury cruise, just raw, unfiltered river life.
