Welcome to the tourist paradise! It is worth it though but go early in the morning.
We went to the well-known and probably the most instagrammed place in Marrakesh: Jardin Majorelle at around 9, and we still had to fight our way through to be able to take some photos. It is a very beautiful place, and I do recommend it, but only if you go in the morning, at the midday and after you might have to queue even 2 hours to be able to enter.
Jardin Majorelle is a botanical garden that was bought by Yves Saint-Laurent who later worked on to restore it, although it was originally deisgned by a French artist: Jacques Majorelle. It is a bit outside of the city but for few euros you get from the Medina with a taxi.