Jog, walk, bike. We explored two possibilities, both worthy of mention but neither (surprisingly) exceptional. First, the promenade and paths along the lake, on both sides from the city center. Some (maybe 1 km) stretch in park like setting is very nice with gorgeous city views. The rest is of the way is chopped up with detours to street, around houses, public facilities, and even industry. Zurich does not realize the full potential of its waterfront. In any case, runs on these paths do offer one way return from any one of many stops of a boat ferry and trains. The second run was along the main river. There are fair to good paths on both sides. One can easily do 10K of river bank, doing one side on the outbound, crossing over on one of many bridges for return on the other side. Again, the unfortunate truth is that the quality of the paths and scenery diminish past the town center.