This richly decorated Neo-Byzantine church sits on top of a hill which is the highest point in Marseille. The basilica is the destination of annual pilgrimages on the feast of the Assumption.
You ask what to do in Notre-Dame de la Garde. You want to get to know Notre-Dame de la Garde. You will find the following attractions:

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Below is an interactive map, on which are marked attractions of Notre-Dame de la Garde. Below this map is a table.. From the map you can become acquainted with locations of objects. The table provides you with basic information about them.

Aix Cathedral

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Aix Cathedral
French Alps
Aix en Provence,
France

Kathedra St-Sauveur in Aix was built from the 5th to the 15th century. Among the numerous works of art there is the work of Nocolas Froment - the Altar of the Burning Bush.
source: wikipedia/commons

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Notre-Dame de la Garde

Shrines

Notre-Dame de la Garde
French Alps
Marseille,
France

This richly decorated Neo-Byzantine church sits on top of a hill which is the highest point in Marseille. The basilica is the destination of annual pilgrimages on the feast of the Assumption.
source: wikipedia/commons

Point on the map