I am teaching ESL to kids and was thinking about a project:
- Hosting an English teacher and her family 8 days from a tuesday to thursday , so that the teacher and even better, her kids can come in my English club on both wednesays.
- Then my turn to come and stay a week to participate in French classes.

This way each of us can enjoy free time of vacation and help out in class, and practise English and French, I can take the teacher and her family to some sight seing in Provence...

Plus going to UK from Marseilles and vice-versa is easy and cheap thanks to lowcost ( take a look at MP2 airport)

Please let me know if you are interested