We visited Arcachon in June 2017 and really wanted to see the old villas in the so-called Winter Town. While it can be done on foot, the petite train has commentary in English so you get more for your euros! Before WW1 it was home to the rich and famous of Europe taking in the pine-scented air for the health benefits. All of the villas are unique, and it a pleasant way to while away an hour or so. Good value for money.