There is very interesting exotic garden in the district of Les Révoires. To visit it, you should park your car in nearby Jardin Exotique parking lot (GPS: 43.735018, 7.415427). After leaving the parking lot you should turn on the right and walk about 400 meters along the Boulevard du Jardin Exotique. Entrance to the garden (A; GPS: 43.731444, 7.413822) is located at the bus stop. Opposite to it you can see very limited another parking lot so you have to be really lucky to find a free space on it.
Ticket prices for the exotic garden are as follows: adults 7.20 €, children and students 3.80 €, the seniors (65+) 5.50 €. Garden is open in summer months from 9:00 to 19:00.
The garden was opened in 1933 and is located on a steep rock on which grow thousands of species of succulents (mostly cacti). There are some paths from which you can have magnificent views (B; GPS: 43.730947, 7.414357) of plants, as well as large areas of Monaco. At the end of the tour there is a possibility of entering natural cave of La Grotte de l'Observatoire, in which you can find many stalagmites and stalactites. Visiting the cave is possible only with a guide in every full hour.