If being by the water is a major draw, Fabrégas Beach is a spot you might want to check out, located 1 mi (1.6 km) from central La Seyne-sur-Mer. If you want to continue walking by the waves, head to Plage du Bœuf and Plage de la Verne, both within a short walk.
Why not spend a lazy afternoon at Plage de Mar Vivo during your trip to La Seyne-sur-Mer? Wander the seaside and beaches while you're in the area.