If your idea of a good vacation means being near the water, visit Tenjin Island. No matter what you choose to do here, you're unlikely to get bored of those pretty views.
Plenty of visitors to Sajima have this water-surrounded land mass on their itinerary. But Tenjin Island is just one of many places worth checking out in the area. If you've got time for more, Zushi Beach will keep you on the go.