If there's one thing not to miss in Cannes, it's the film festival. This major beach destination in the French Riviera plays host to the world's celebrities in May each year. Thus, the number of tourists reach bewildering count. The best option that presents itself would be to visit Cannes during off-season.
Everything is relatively cheaper during Autumn, from food in the restaurants to hotel room rates. Starting from September, Cannes paints a pretty picture with cooler climes and less star-watching tourists. Restaurants also see few people, letting you unwind after a day's sunworshipping. When October comes, the weather drops to around 13 degrees but overall, Cannes benefits from a year-round mild Mediterranean climate.
Keep in mind though, that restaurants close around November. Off-season also brings more cheap deals for Cannes hotels and packages. Check the internet for more off-season options, so you can grab a holiday in Cannes at a less harried pace.