https://benesse-artsite.jp/en/calendar/
Passport holders can see each of the festival's artworks once during the pass' validity period, including some of the established art museums on Naoshima (Benesse House, Lee Ufan Museum, Art House Project) and Inujima (Seirensho, Art House Project). Among the sites not covered by the passport are the Chichu Museum on Naoshima and the Teshima Art Museum.
Alternatively, it is possible to forego a passport and instead pay admission to each artwork separately. The typical cost is 300 or 500 yen per site, except for the Chichu Museum, Benesse House, Lee Ufan Museum, Naoshima Art House Project, Inujima Seirensho and the Teshima Art Museum for which the admission fee is 1000-2100 yen each.
ferry schedule: https://www.shikokukisen.com/en/instant/
suggested week-long itinerary for a trip to Naoshima and the surrounding area:
Day 1: Arrival in Naoshima
Day 2: Explore Teshima and Inujima