McLHCb Near Ferney

The new well-known Scottish restaurant is now open just inside France over the Mategnin border. The restaurant and outdoor playground are situated close to LHCb which is one of the four LHC experiments at CERN. You can eat your burger and watch them play while the big bang is recreated under your feet.

Secret Aeroplane Park in Ferney

This park is uniquely located right up against Geneva Airport's runway. From the climbing frame you can view private jets and huge boeings roar in right next to you. The park is a nature reserve and there are often plane spotters sitting on the many benches overlooking the runway.
I particularly like the merry-go-round and its ability to make you feel quite sick while you attempt to demonstrate conservation of angular momentum.
To find these swings park by Lidl supermarket and head through the gate in the fence past the large ponds.