Running 25km between Bidart and Hendaye is one of the Basque Country's best-kept secrets: the Sentier du Littoral. This coastal hiking trail passes through the region's most beautiful seaside scenery, carpeted with fragrant maquis, pockmarked by rocky coves and backed by the shimmering blue line of the Atlantic horizon.
A downloadable route map is available from the Guéthary tourist office website.
There are access points at various locations between Bidart, Guéthary, St-Jean de Luz, Socoa and Hendaye. It's perfectly feasible to just do a couple of sections and then catch a bus or train back to Biarritz or St-Jean de Luz. Interpretative panels are positioned along the trail.
Bring plenty of water and sunscreen, and aim to do your walking in the early morning or late afternoon, as the summer sun can be relentless.