Ritesh Sharan
Google
Really beautiful Lake about an hour drive from Lausanne. It's an awesome hike if you are up for it with some breathtaking views from the top. The hike is not too tough and can be done in just about an hour, ending with a nice restaurant at the top of hill.
The return leg of the hike can be done via a forested area though if you do that, then the start and end points of the hike will be about a km off.
There are also restaurants around the lake and public parking areas are also available.