When you come by car, it is virtually impossible to park for free. It costs 22 € every 12 hours so 6 days costs 3168 kr in parking. It is fierce
You can park along the beach or at the town square (both places against payment, but parking along the beach is the cheapest way). You can also park on some of the smal roads in the town (free of charge). Public transportion (bus and/or train) to Nice, Antibes and Cannes is a very easy and cheap way to get around.