On the GR Arles - Marseille, you can walk on the paths along the sea or in the hills of la Nerthe. A wonderfull path from the gîte to Niolon and come back by train (3h)
see some path on visorandoTake the boat to sea our nices calanques, why not?
A lot of possibility to dive (all nivels) in la Madrague Paul Catoni can do with his Zodiak http://www.meretplongees.com
You can rent kayak at the Rouet beach. And why not just enjoy the sea? Snorkeling! contemplate, heard the birds...
Young or old Fisherman, la Madrague is a fisherman place. The proximity of parc marin allow the reproduction of all the species. Some boat from Carry to the big fishs. You can always buy your fish to the calanques's fishermen.