As opposed to, for example, Natal, Fortaleza or Rio, the beach in Recife sucks. The colonial center is however worth a visit, as it boasts numerous historical buildings and churches (Recife Antigo). On the waterfront area, check out also the Sculpture Park of Francisco Brennand, featuring a number of giant penises.

Another activity that I couldn't do due to lack of time is scuba-diving in the shipwreck park, off the coast of Recife. It requires a bit of advance planning, but a dozen shipwrecks are accessible to tourists. If any of you did it, please post your comments below: I plan to return to Brazil soon...