Go straight to the Bahnhofstrasse and enjoy strolling along the high end boutiques of Europe.  Swiss watches will always make you drool.  It is easy to get here because it is right by the main train station.  Window shop/Actual shop, dine, enjoy the view at this area.  If you have more energy for walking, head to the Zurich lake to feed the birds.  It is a free and enjoyable fare.  Get your free bread at a sausage place near it.  Might as well order veal to beef to pork sausages here.  Going here and at the back of Bahnhofstrasse, there are remarkable architectural buildings that is great to explore.  Don’t miss it!