You can book up to 1hr before each cruise departs.
Saint-Nazaire-en-Royans pier:
Cruise of approximately 1h30, only departing from and returning from Saint-Nazaire-en-Royans (the boat no longer stops at the Jardin des Fontaines Pétrifiantes)
Concessionary prices:
When presenting your e-ticket, you must show proof of your status.