The itinerary lasts 3hrs 40min, and has 2 steps, and it will cost 87 euros minimum.

Paris - Dax
The step from Paris to Dax lasts 3hrs 17min. You'll travel in a TGV Inoui operated by SNCF Voyageurs.
On board, you'll have access to: Wi-Fi.
You can find tickets from 77 euros.

Dax - Bénesse-Maremne
The step from Dax to Bénesse-Maremne lasts 00hrs 23min. You'll travel in a regional train.
You can find tickets from 10 euros.