If you're happy with just the restaurants there, which there is a large selection in offerings and prices, you should be good without a car for a short 5 day trip. There is the Petit Casino store where you can buy groceries and supplies and On Dur Strait ( I probably botched the name) if you want some prepared foods or charcuterie items. Good Morning serves a great breakfast and sandwiches if you want to pack them and take to the beach.