There are not many interesting monuments in Cannes. There is a small museum on the Suquet hill. The hill itself is nice. The Croisette is unavoidable.
According to us, the best thing to do in this city is to take a boat and go on one of the two Lerins Islands facing the city. Do not forget either to walk or hike in the Esterel (next page).
If you can afford around 100€ for this, (for 3 people), you can go to the nearby Cannes Mandelieu airfield and contact one of the aeroclubs to get a short flight around the islands. (The flight may not last longer than 30mn). Do it when you have visited the place on the ground, it will be more interesting.
If you stay in Cannes use this agenda to know the cultural events which you will be able to attend.