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.

Adjacent to Carouge's Museum

Just by the museum in Carouge is small but perfectly formed park. It's a short walk from the excellent Saturday market place here. Go through the gap in the stone wall to find the park.

Indoor Play In Carouge - Wolfisberg

Wolfisberg is a laid back and sophisticated bakery and cafe, it's good for coffee, lunch or a drink. Children are well catered for with a climbing frame sensibly separated from the diners by a sheet of perspex - fabulous!

The Lizard of the Jardin Botanique

Geneva's Jardin Botanique is quite simply amazing and we seem to never go into town without visiting. It has  bespoke wooden climbing frames with rope bridges, an excellent hoist to lift the sand and a lovely lizard and bugs to balance on.

There's a unique carousel, a cafe for a beer by the playground, peacocks roaming and an animal park on the other side of the green. If you have never been here... go!
Beyond the playground there are touch and feel plant areas, a hot house, ...

A childrens' amphitheatre provides story telling opportunities though I don't know if anyone organises them?

Switzerland while famous for being expensive offers a lot of stuff, like this, for free.

Playing in Geneva Airport

Geneva airport has some of the best facilities for babies and toddlers. As well as a play area there are children's beds and cots.  The room is open from 08:30 I believe but I have heard of it being opened especially over night for people stuck at the airport. It can be quite tricky to find and is flight side just after the security check.

This place is so good it is worthwhile coming to the airport a bit early in order to spend some time there.

Meyrin's Moon Base

It's a little know fact that Meyrin has it's own moon base. This is never a very busy playground in my experience since people probably get distracted by the nearby Jardin Alpin. As well as four climbing structures there is a large concrete slope whose purpose is a mystery. A sign warns against cycling or skating down this slope.

Parc des Bastions

Parc Des Bastions

Sandpit, Parc des Bastions

When the sun is out the white wooden climbing frame in Parc des Bastions must be one of the busiest playgrounds in Geneva.

There are some wooden hobby horses and one of the best sand pits in the area. The sand pit includes running water for excellent dam making opportunities.

School Playground, Geneva Old Town

In the old town of Geneva is a school playground which seems to be open to the public when not in use.
It's near the museum of art and history and good to stop at if you happen to passing. There are good hop scotch and similar games on the ground as well.

Ahoy on a Sea of Sand in Nyon

Pirate Ship Nyon

Truck at Nyon

Playground at Nyon

Nyon has a fantastic park, there are great play areas to either side of the Museum of the Lake. On one side of the building there is a pirate ship on sand. There are buckets and cranes to hoist the sand up and down through funnels and the like providing endless hours of fun.

On the other side of the museum there is truck to drive, some slides and a self propelling merry-go-round.

There are picnic tables including some that are sheltered from the rain and sun. Given its great setting, this playground definitely has to be one of the best in the area.

By The Lake at Nyon

Nyon Lakeside Playground

Nyon Lakeside Playground

The lakeside at Nyon is an impressive location for this playground. You get excellent views of the lake and the Alps, including Mt Blanc on a good day.

The climbing frame is great, there are swings, a slide and one of those self propelled roundabouts with pedals. There's a picnic table and the playground is well fenced.

This and the nearby pirate ship make Nyon a top destination for playgrounds.