To get to the location of the school, you can take the train to Toulon, then the bus stopping at the Tourism Office of La Londe les Maures and then walk to "Agelonde".
For an introduction to La Londe les Maures, see La Londe les Maures.

There is a TGV starting from Paris and taking between 3 and 4 hours to get to Toulon. It runs basically every hour. For more information, see SNCF.
Please note that the tariffs are far  cheaper when you book in advance.

The bus starts from  Toulon railway station. It is the line from Toulon to Saint Tropez.
There is basically a bus every hour, and the trip takes around 40 minutes.  You can get the
schedule at SODETRAV.

Finally you need some walking to come to the location of the school. You can find a map
 here, showing the tourism office and the meeting location.
Other documents are available :
Access plan
Plan of facility
Transportation costs
The school will try to organize some transportation if we are informed of a sufficient simultaneous number of arrivals.