On the waterfront, the Espaço Cultural da Marinha is a sailor’s delight. Moored along the dock are the Riachuelo submarine and the Bauru (a small WWII destroyer), which have been turned into floating museums. You’ll also find a 19th-century vessel used by Dom João VI, countless ship models, and maps and navigational instruments charting the history of imperial and Brazilian navigation. The boat tour to Ilha Fiscal leaves from here.