Upvote:0
The best approach would likely be : - Cannes to Nice : 30 minutes driving - Nice to Paris : 1h flight - Few days in Paris - Paris to Geneva : 50 minutes flight
From Nice to Geneva, you will also find direct flights but there are less options than the other way.
Upvote:1
I feel the main attraction of including Switzerland here has to be a scenic road trip over the mountains. I think the main ones are the Forclaz pass between Chamonix and Martigny (relatively low) the Great St Bernhard pass (still closed in april) and the Simplon pass, which reaches 2000m and is usually kept open in winter.
But the route Cannes-Simplon Pass-Disneyland-Paris is 1209km and takes over 13h of driving according to Google Maps. Whether it is worth spending so much time in a car (I think the time is optimistic) is up to you. You'd need to rent a car in Cannes that you can drop off in Paris, and find places to sleep along the way.
On the plus side -- the route follows the Mediterranean for a long time, passing Nice and Monaco and stretches where the mountains almost reach the sea, before it turns over the flats until it goes into the high mountains for the pass. And in Switzerland, Sion, the Rhone Valley and Lake Geneva are very scenic, and you can visit Montreux or Lausanne.
But it takes quite a lot of time, and you only have a few days. Combined with a day Eurodisney, this may result in basically skipping Paris...