The route, perhaps, one - walking along the sandy promenade La Bol, which stretches along the ocean coast for 9 km (together with the beaches of neighboring towns, the length of the coastline is 12 km).
Advice to tourists. In La Baule in principle there are no tall buildings, especially along the promenade, to determine by eye the distance traveled along the beach is quite difficult, so orient yourself on the bright sign CASINO - huge letters can be seen from almost all remote points of the beach.
After you've admired the marina to your heart's content, head to one of the city's parks and gardens - there are plenty of them. For example, Bois des Aulnes, Victory Garden, Parc des Dryades, Tropicarium Bonsai. The logical conclusion of a walking tour of La Baule will be a visit to the saltworks museum in Ba-Sur-Mer and the aeromuseum.