I recommend you to take a tour to Cassis and join one of the many boat trips offered there. If you prefer a private service rather than the cruise tours: provenceprivatetour.com.
I personnaly did their Calanques National Tour and it is a must. I didn't want to board the classic boat tours because they don't stop for a swim. Our guide knew a walking access to the Calanques. After a 20 minute walk (hike) we were swimming in the laguna. On the way back to the ship we could have a panoramic tour of Marseilles.
Calanques from Marseille
in France Ports
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