There's a restroom and a hiking map in the parking lot. You should take a photo of it, as it will help you navigate even better.
There are three different options: a 3 km hike, a 7 km hike, and a 12 km hike. It's well signposted, so you can be sure you'll find the right path. On the middle hike, it was wonderfully quiet, and a very enchanting path ultimately led to the mountain hut, from which you have a beautiful view of the lake.
Unfortunately, you can't get to the lake itself.