cheap things to do in zurich switzerland?
['See Panoramic Views from atop Grossmunster Church. ... ', 'Tour Zurich on Boat, Tram or Train. ... ', 'Join a Free Walking Tour. ... ', 'Explore Zurich on Bike for Free. ... ', 'See Zurich from the top of Üetliberg Mountain. ... ', 'Go (window) shopping! ... ', 'Swim in the Lake during Summer for Free. ... ', 'Visit the Zurich Zoo.']