I really recommend taking a tour around one of the favelas in Rio de Janeiro - it is one of the most interesting (and exciting!) things I have done during my travels. It's a real eye-opener to wander down through the tiny streets of the favelas, seeing how so many people live in such poverty. All the people we passed seemed happy, were incredibly friendly and loved to have their photos taken (except for the drug dealers, who we were advised not to photograph!). Absolutely fascinating trip, with the added thrill of a ride on the back of a motorbike to get there. Great views of the city too.
Rocinho favela, tour arranged by bealocal.com
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