Ishigaki's Blue Cave sits on the coast north of Yonehara Beach, a half-submerged sea cave with a white sand floor and stalactites inside. You swim in at high tide and walk in at low tide. Here is how to get there, how to choose a tour, the best time of day, and what to know before setting out on your own.

A guide to Kabira Tabaga in Kabira on Ishigaki Island. A natural beach of white sand in a small cove ringed by rock, with exceptionally clear water and a handmade swing that made it a photo spot. How to get there, parking, the best tide for snorkeling and what to watch out for.

A guide to Yamabare Coast (Crystal Beach) in Kabira on Ishigaki Island. Natural quartz washed down from Mt. Omoto turns up in the sand here, and the water is clear with coral offshore. Parking, facilities, how to get there and why swimming is not advised.

A guide to Hirakubo Sunset Beach on the west side of the Hirakubo Peninsula in northern Ishigaki Island. Entry, parking and restrooms are free, and there are showers, rental gear, marine activities and food trucks. Facilities, fees, parking and access all covered.