We visited this municipal market on the outskirts of Rio, for the Flower and Plants section, which was varied, extensive in range and an amazing experience. Nowhere in the world would you see such a wholesale market for tropical plants including orchids, bromeliads, etc. The market is large and spread over 100,000 square metres.
On weekends, particularly from afternoon onwards the place is brimming with locals - there is music and a number of restaurants and pricing substantially lower than in the city. A bit far but easily accessible by Uber if you are worried about safety.