I spent the day at the Trübsee in Engelberg on Saturday. Although I was not the only hiker that day, it was still quite peaceful.
I was lucky with the weather and could take numerous beautiful pictures.
To go up there, you need to take the gondola in Engelberg. 28 CHF for 2 with the Swiss Halbtax Abo. Last gondola to go back down to Engelberg is at 5:15 p.m.