Spend 48 hours enjoying Lisbon to the max on 2 different double-decker bus tours and 1 boat tour.  Belém Lisbon Bus Tour In this Lisbon tour bus, travel along the city's main avenues with the fresh breeze of the Tagus on your face — from the historic center to the monuments of Belém. This iconic area is an obligatory stop on any Lisbon tour buses, with its monuments to the Portuguese voyages of discovery: the Jerónimos Monastery, Tower of Belém, and Monument to the Discoveries, as well as various museums (the Carriage Museum in particular). Modern Lisbon Bus Tour This trip follows the Tagus from the heart of the city to Parque das Nações. On this site, which famously was the venue for the 1998 World Expo, you'll come across distinctive modern architecture alongside leisure areas and restaurants. While you're there, don't miss the Oceanarium, the second largest of its kind in the world. And because Lisbon wouldn't be Lisbon without its traditional fado music, take a trip to the house museum dedicated to its greatest singer, Amália Rodrigues. Yellow Boat River Tour Far from the noise and rush of the city, during Lisbon's boat trips it seems like you are standing on a floating stage with a privileged view to the “7 Hills City”. While slowly drifting along the Tagus river surface, you can observe some of the most important monuments such as the Saint Jorge Castle, the Sé Cathedral, and the April 25th Bridge.