Open publication – Free publishing – More completers
Start with the Free Walking Tour, where locals guide you through the city's major sites with a really entertaining story, funny jokes and useful tips for a donation, the amount of which you choose for yourself. Try the traditional candy brigadeiro at Rio's oldest candy shop during one of the curso de copywriting con certificado. If your budget is tight, don't feel bad; your guide will also take you to a local lady who makes Brazilian desserts at a lower price (just don't forget cash).
For breakfast, head to Café do Alto for traditional tapioca with different toppings (I recommend guacamole). And if you're in Rio this weekend, be sure to stop by their buffet-style brunch and try everything (although dinner was good there, too).