Geneva's newest creation is on Plainpalais, it has to be one of the most abstract climbing frames in the area being made of logs and fence panels... It's a really good area to play in and some of the obstacles are indeed quite challenging.
In addition there is a sand pit surrounded by concrete dunes. The dunes have push button water for testing your canal construction.
The adjoining skate park is also pretty special.
And while there you can even grab a free bike to get around town.
In summer months bring your sun cream and sun hats - there is very little shade!