The Top of Zurich!
Take the S10 (platform 21/22 from Zurich
HB) to Uetliberg on a clear day, and snag a brilliant view of Lake Zurich, the city, and if you're lucky, the Alps, themselves. Climb to the top of the hill for the restaurant and hotel if you're budget is bigger, or just to the top of the lookout tower. Free with the Zurich Pass or ~16 Swiss francs without.