Okinawa is one of the easiest places in Japan to try clear-water boat diving. Most visitors base in Naha and day-trip to the Kerama Islands; Ishigaki is a separate hop for manta-focused trips.

Use the JPFun Scuba map to compare dive areas, then lock lodging near your departure pier.

Before you fly

• Confirm your C-card (OW or higher) and log book. Many boats ask for recent dives or a check dive.
• Book hotel + dive shop early for Golden Week, Obon, and consecutive holidays.
• If you get seasick, pack medication and eat light the morning of the boat.
• Rent gear your first days; buy only what you already know you like.

Kerama day-boat rhythm

• Meet early at the shop or Tomari port, then 30–60 minutes to the sites.
• Typical day: two dives, lunch on board, back mid-afternoon.
• Visibility and current change fast — trust the guide’s site call.
• Surface intervals are for water, shade, and not scrolling in the sun.

Shop questions worth asking

• English or Korean briefing available?
• Maximum group size per guide?
• Nitrox / computer rental?
• Bad-weather policy and refund window?

After the dive

• Easy dinner near Kokusai-dori; skip heavy drinking the same night if you dive again tomorrow.
• For a flat day, switch to the JPFun Surf map (Okinawa) or plan a rest day inland.