I highly recommend the Rio Original Bike tour. The bicycle is definitely the best way to get a feel of the city and its parks. The tour is 100% on cycle paths so you don't have to fight the insane Rio traffic. It runs through the Aterro do Flamengo park with views of the Sugarloaf and the Christ as well as the heavenly Guanabara Bay. Thais and Mark are excellent guides and really know the city and its culture inside out. It was the best thing I did on my trip to Rio by far. At R$70 it was a steal given that is roughly the same price as renting a bike on your own.
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