Why not spend a lazy afternoon at Fontonne Beach during your trip to Plaine de la Brague? While in the area, you can find time to visit its spas.
You can stroll along Port Vauban for relaxing water views when you're in Antibes Old Town. Hotels.com travelers also say the area is walkable and has lots of nice beaches. If you carry on walking you'll get to Salis Beach, Gravette Beach, and Plage de Ponteil for some more water views.