The 5-Lake-Hike is a famous hiking track close to the town of Sargans in Switzerland. It can easily be done in one day and the most complicated part of the track is basically making sure that you are not missing the last chairlift down to Sargans. So don’t start too late and try to go on a sunny day where you can really enjoy the panorama views.
More information, including GPS track (which is not needed) can be found here. Be aware that this track goes up around 550m and descends around 900m in just a couple of hours.