From Anduze to Saint-Jean-du-Gard with a stop at the Bambouseraie… you will enjoy a marvelous day:
walk from the Le Castel Rose and take the first train to Anduze,
get off at the Bambouseraie for a visit,
get back on the train in late morning for Saint-Jean-du-Gard, eat lunch and visit the town, take the evening train back to Anduze, and walk back to the campsite…

Website: the steam train