Hirasawa on the Izu Peninsula is a shore-entry site suitable for beginners, featuring a mix of reef, kelp forest, and artificial reef structures. The site ranges in depth from 5 to 25 metres. Divers experience mild currents and visibility that fluctuates between 5 and 25 metres. The area is well-equipped with facilities including parking, showers, changing rooms, and a rinse station. Due to the presence of sharp coral and rocks in the shallow entry areas, divers should exercise caution and wear appropriate protective footwear. Buoyancy control is recommended to avoid contact with the substrate.

Osezaki is a shore dive located on the Izu Peninsula, offering a mix of muck and reef topography. Divers can explore depths ranging from 7 to 40 metres, with an average depth of 12 metres. The site is situated 30 metres from the shore and is known for being relatively calm and sheltered from weather conditions. Visibility typically fluctuates between 5 and 20 metres, and currents are generally mild. The site is suitable for beginners and supports night diving. Facilities available on-site include parking, toilets, showers, changing rooms, air fills, equipment rental, a cafe, first aid, and boat charters.

Ida Beach on the Izu Peninsula is a shore-entry site featuring a gentle underwater slope. This topography makes it a suitable location for beginners to snorkel. The site is known for its clear water conditions, with visibility often exceeding 20 metres. Water temperatures at this location fluctuate throughout the year, ranging from 16C in the late winter months to 28C in August. Species recorded around this area include guitarfish, Indian lionfish, pufferfish, blacktip grouper, various wrasses, Clark's anemonefish, and several types of nudibranchs and sea slugs.

Ita is a shore-entry site on the Izu Peninsula featuring a combination of reef and drop-off topography. The site ranges from 10 to 35 metres in depth, with an average depth of 10 metres. Divers and snorkellers should be prepared for strong currents, which are a defining condition of this location. Visibility typically spans 10 to 30 metres. On-site facilities include parking, showers, and changing rooms, providing convenience for divers after a dive. Due to the demanding nature of the currents, this site is best suited for intermediate-level divers. Typical dives last approximately 40 minutes, and it is recommended to time entries around slack water.

Atami Kosoga Cave is a shallow marine cave located off the Izu Peninsula, Japan. The site is suitable for beginner divers, with depths reaching a maximum of 10 metres. Access is strictly by boat, and divers should remain aware of boat traffic when surfacing. Conditions are generally manageable due to mild currents, though visibility within the cave can be variable. Divers are advised to carry a torch to navigate the cave structure safely. As there are no permanent facilities on-site, check for local availability before planning a trip. Exercise caution to avoid contact with the cave walls and floor while exploring this shallow environment.

Toi Beach on the Izu Peninsula offers a diverse underwater environment featuring a natural reef, a wreck, and an artificial reef structure. Suitable for beginners, the site ranges from 2 to 15 metres in depth with an average of 10 metres. Shore entry leads to mild currents and visibility typically between 10 and 30 metres. The site is well-equipped with parking, toilets, showers, changing rooms, and rinse stations. Night diving is permitted, providing opportunities to observe the reef after dark. Divers should remain aware of the presence of jellyfish and sharks in the area throughout their dive.

Bitagane is a reef dive on the Izu Peninsula that extends from the surface to a depth of 24 metres. This site is strictly for advanced divers due to strong currents and the presence of sharp coral. Visibility typically ranges between 10 and 20 metres. Divers must use boat access, and precise buoyancy control is essential to navigate the reef structure safely. Species recorded around this area include wrasses, pufferfish, scorpionfish, reef squid, and various shrimp and snails. Divers should coordinate with boat operators to time descents with slack or early flood currents to manage the challenging water movement effectively.

The Atami Wreck is an artificial reef located 400 metres offshore on the Izu Peninsula. Resting at depths between 18 and 35 metres, this site is suited for intermediate divers. Access is by boat only, and divers should be prepared for variable visibility ranging from 5 to 40 metres. Currents are typically mild, though stronger surges can occur. The wreck structure presents an overhead environment, requiring caution to avoid entanglement. Water temperatures fluctuate between 17C and 25C, with a summer thermocline and potential winter lows of 10C. Divers should remain vigilant for boat traffic when surfacing.