Hannekes Boom is one of the nicest waterfront café in Amsterdam to have a beer when it's sunny. Close to Central Station, the place isn't crowded by tourists, but you need to be there early to get a seat.
This place is a sympathetic alternative terrace outside the crowded city centre. It is located in Amsterdam North, 5 minute bike ride from the Ferry. They serve good food for a reasonable price. Sometimes there are bands or DJ' playing. Check the website : )