Hidenchigama is a cave dive located off Aka Island in the Kerama Islands. This advanced site features an overhead environment with depths reaching 23 metres. Divers must navigate variable visibility and potential entanglement hazards within the cave system. Due to the nature of the terrain and the overhead environment, this site requires careful equipment management and the use of torches. Access is exclusively by boat. Water temperatures range from 22C to 29C throughout the year. Divers should confirm current conditions locally before planning a dive, as visibility can change unpredictably.

Ara Beach on Aka Island is a shore-accessible snorkel site featuring a large coral group located approximately 200 metres offshore. The site is suitable for beginners, with depths ranging from 1 to 8 metres and an average depth of 4 metres. Visibility typically varies between 10 and 20 metres. Snorkellers should be aware of moderate currents and sharp coral in the area. Facilities at the beach include parking and toilets. The site is situated on the southern coast of the island, surrounded by mountains, and offers a quiet environment for water activities.

Tropical Fish House is a natural tide pool formed by volcanic rock on the northern coast of Aka Island. This shallow site is suitable for beginners and is accessed directly from the shore. Depths range from 1 to 3 metres, with an average depth of 2 metres. The site experiences mild currents and visibility typically fluctuates between 5 and 20 metres. Due to its shallow nature and protected rock formation, it provides a calm environment for snorkelling. Water temperatures vary throughout the year, ranging from 22C in February to 29C during the summer months.

Eef Beach (Central) on Aka Island is a 2km stretch of white sand beach. The site features an inner lagoon with sandy bottom conditions, protected by an outer reef that keeps the water calm. Small coral heads are located closer to the reef edge. This site is suitable for beginners and offers shore access for snorkelling. Water temperatures range from 22C in February to 29C between July and September. Due to the protected nature of the lagoon, it provides a calm environment for those looking to snorkel in the Kerama Islands.

Imazuni is a reef and drop-off site located off Aka Island in the Kerama Islands. The topography features a shallow reef starting at 7 metres that transitions into a wall descending to 30 metres. Visibility is consistently 23 metres. Divers should expect a moderate current running along the drop-off, which requires careful management; it is recommended to stay near the reef and use the wall for shelter. The site is suitable for beginners and supports night diving. The habitat supports a variety of reef fish and invertebrates typical of the Okinawa Islands region.

Tatami-ishi on Ojima Island is a shallow reef site known for its distinctive hexagonal rock formations. Accessible via shore entry, the site is suitable for beginners and families, offering snorkeling opportunities within tide pools and crevices at high tide. Depths range from 1 to 5 metres, with an average of 3 metres. Visibility typically varies between 10 and 30 metres, and currents are generally mild. Water temperatures fluctuate between 22C and 29C throughout the year. Parking facilities are available for visitors at this location.

Tonbara is a reef and pinnacle site located off Aka Island, Japan. The topography features a deep structure ranging from 15 to 40 metres, with an average depth of 25 metres. This boat-only site is characterised by strong currents, which require careful planning and coordination with local operators. Divers should aim to dive during slack water to manage the current effectively. Visibility at the site typically fluctuates between 10 and 25 metres. Due to the depth and the potential for significant current, this site is suited for intermediate and advanced divers. Always monitor local conditions closely before entry and adhere to established boat safety procedures.

Manta Station is a reef site located 4000 metres off Aka Island in the Kerama Islands. This site is primarily accessed by boat and is suitable for advanced snorkelers. The topography features a reef environment with depths ranging from 7 to 18 metres, averaging 8 metres. Water temperatures remain warm throughout the year, ranging between 22C and 29C. Divers and snorkelers should be aware of boat traffic and surf conditions in the area. The site supports a variety of reef fish and invertebrates typical of the subtropical Okinawa Islands habitat.