There is a shuttle service to Bombane where the Utopia campground is located. You will be left with 300 meters walking from bus stop to campground. If you are heavily loaded contact the organiser for help.
Details of the bus route is here below:
You get in at first stop - (Gare Saint Jean) and you get out at Bombane.
One stop before the last one.
Week-days, the service is running every 45 minutes but only from 12 to 6 Pm