Miyako is Okinawa's boat-diving destination for sculpted limestone: W-Arch off Irabu, and the famous Antoni Gaudi, Satans Palace and Toriike complex near Shimoji. The best site depends on the wind, not simply the calendar. Some published routes enter genuine overhead environments, so a generic Advanced certification does not replace site-specific cave or cavern qualifications. On Miyako, Aragusuku and Shigira provide better-known guided or carefully assessed shallow snorkeling, while the Yabiji coral reef is an offshore, weather-dependent boat trip with operator access only. Non-divers can drive Irabu Bridge, visit Toriike from its boardwalk, explore coastal viewpoints and enjoy Miyako soba. This is primarily a local base-and-day-boat trip, not a liveaboard destination. See the broader Okinawa guide for prefecture context, not as a substitute for this island-specific plan.