One thing that I always look forward to in Zurich (besides the lake, the river, the weather, the plazas, streets, and street life) is having a super delicious bratwurst with a typical bürli bread at the original Sternen Grill directly at the Bellevue center station. It is a total trend-spot not only for tourists. The meat is of the best quality and is served with bread and spicy mustard. You could either sit upstairs or at the small tables in the entrance area, or, as I suggest, take your meal to go and enjoy it at the lakes edge on the many benches. Swans and ducks are your guest and audience, but they don´t bother you or get aggressive, so it´s actually really pleasant. Especially on a nice summer day, nothing beats hanging out at or on the lake!