Cycling from Arnex to the Signal de Bougy and back is a nice ride that takes you along the lake through the lower part of Nyon, Gland towards Rolle, and from Rolle up towards Perroy, Aubonne, Pizy, The Signal de bougy and back down on the other side.
This route can be ridden both ways. The direction I suggest is easier because the climbing, although physical from Rolle to Perroy levels off, The next challenge is up from Aubonne to the Signal De Bougy. This climb is physical, and you are exposed to cars.
When you’re at the top you pass by two large car parks, and you could stop and go into the Signal but I have never tried, after a bike ride, so I do not know where you could leave your bikes. I instead continue along the park, pass the golf course and then when I get to the end of the road I usually turn left and enjoy the downhill through the forest for one bit, and then the vineyards for the other.
The advantage of this route direction is that it’s downhill from the Signal De Bougy, almost all the way back to Nyon, or wherever you start this journey.
If you try the reverse route you will be climbing from Nyon to the Signal de Bougy on a road that can be quite busy and you will feel more fatigued. The part from Tartegnin up to the Signal De Bougy is physical so you need to have endurance.
If you try this route and you find that you have spare energy left over you can then continue towards Bière and either go up the Col De Marchairuz or the other col, cycle around the Vallée de Joux, and then come back down via St Cergue. That’s a 90 kilometre loop.