Heineken factory tour is very good, plus you can get a free canal trip to and from the factory. Flower Market is a pleasant walk, Gauchos Argentinian Beef restaurant is great, theres two in Amsterdam, you may need to book. There was a 2 hour queue both times we went to see Anne Franks House so we didn't bother, a walk around the red light district is a must. We hired a boat too one time was funny as we didn`t sink but not for the faint hearted with all the canal traffic. Behind the Central Train Station is a Wharf where there are a series of free walk on ferries that link the various sides of the river, do a little homework and explore outside the center. Theres a lot of development in one area, restaurants, galleries etc, can`t remember the destination name but if you have your back to the station its the last one on the left.