1. Porto: 3-Hour Bike Tour
See the sights of Porto by bike on a 3-hour sightseeing tour of the city's memorable monuments. Access areas that other vehicles can't reach and go further than you could on foot. Discover sites of interest in the Old Town and pedal along the bike paths of City Park. Along the way, see the former customs house of the Alfândega do Porto Congress Centre and admire the span of the Arrábida Bridge and the remains of São João da Foz castle. Cycle past the fine sand beach of Matosinhos, look for birdlife in Calém Garden and reach the magical mouth of the Douro River. Discover where the Port Wine Museum, Tram Museum and Museu Serralves (Contemporary Art Museum) are located. Visit the remains of São Francisco do Queijo (Cheese Castle), get back to nature in the Douro Estuary Natural Reserve and gaze in awe at the breakwater of Foz do Douro.