Starting where the bus drops you off this is a nice hike to the tower which offers a really great view of Lausanne and lac Leman by the mountains. It's an interesting wooden structure and well worth the visit just for the view.
The hike back down to Lausanne is awesome! There is a wide variety of plants to see and there are occasional pretty views of the lake and city. There are fields that are good for picnicking on the way down.
If you are in reasonably good health it's just a nice walk but this trail would be challenging for some.
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