Hope you are staying at the Marriott in Monte Carlo. It is a great property within walking distance of some fun places. Note: the last picture is a view from our room, looking at the Cap d'Al harbor and the Med. Sea.!
Take a look at some of the places you may enjoy. The rest. is a good one at moderate prices and within easy walking distance of the Marriott. Enjoy Saliere for good food right in the harbor area.
My wife and I absolutely loved Eze, a walled Medieval city that overlooks the Med. It is now an artist's community. Another nice day trip was to a similar city called St. Paul-de-Vence. These are two wonderful gems to visit. When near St Paul da Vence, don't miss out on a trip to the Mattise Chapel in Vence.