ah, Cannes, my favourite part of the Cote d'Azur. you can run along the see front but mind the dog poo, everyone seems to have little yappy dogs that poo on the pavement. To be honest I wouldn't bother running, just eat and drink in the old town, particularly Rue de Suquet - very near to where you're staying. Fantastic food, a bit pricey, but worth every penny.