The Island of Porquerolles is one of the most famous islands of the Var region. Only one marina is available but you'll find plenty of anchorages mostly on the Northern side of the island.
Dreamlike beaches, beautiful water, hikes and bike trails on the island and an island the becomes quiet in the evening once the last ferry leaves the marina... Obviously a place like that attracts a lot of people! If you want a spot at the marina, get there early (7am?).