What is the cheapest way to travel in France from saint hilaire de riez to le grande motte?

I am going to saint hilaire de riez next week but I want to travel to le grande motte (or any good beaches that are going to be hot) - what is the best way to get there (I do not want to drive), how long would it take and where can I find how much it costs.

Any advice would be much appreciated.

Thanks
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