You just buy one return ticket and that's it. Remember to validate ticket upon entry to the platform. There is a machine with a slot for the ticket at the entrance. You can hop on and off each way, just as you like.
www.voyages-sncf.com for ticket prices and timetables
The stations you should exit and enter are called "Monaco-Monte Carlo" and "Menton" (thus not "Menton-Garavan")
You can see the rail in Google Maps. This is not complicated, do not worry...
That's great - thanks.
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