Do some people-watching at Plaza de Armas. If its well-trodden pathways could talk, this historic square would have countless stories to tell.
You'll be spoiled for sightseeing choice in Iquitos. Plaza de Armas is an ideal place to begin here, but there are lots of other fine spots to check out. Plaza 28 de Julio, Iquitos Cathedral, and Tapiche Reserve are near the public square and will fill in your day nicely.