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.

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.

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.

Koganezaki is a shore-entry site located beneath the Horse Rock on the Izu Peninsula. The topography features a mix of reef, artificial reef, and muck environments, characterised by rare white sand. Depths range from 5 to 18 metres, with an average of 8 metres, making it suitable for beginners. Conditions are generally calm with mild currents, though visibility can fluctuate between 8 and 25 metres. Surf may present a hazard at this location. Facilities available on-site include parking, toilets, showers, changing rooms, and a dive shop. Typical dives last approximately 50 minutes.

Izu Peninsula reef is a shore-entry site featuring a significant drop-off that extends from 10 to 40 metres, with an average depth of 25 metres. Divers should be prepared for moderate currents and plan their profiles accordingly. Visibility typically ranges between 10 and 30 metres. Due to the depth and current, this site is suited for intermediate divers. Surface conditions require vigilance, as boat traffic is a known hazard during entry and exit. Divers are advised to deploy a surface marker buoy and time their dives around slack water when possible. Water temperatures fluctuate seasonally between 16 and 24 degrees Celsius.

Mikomotojima is a boat-access reef and drift dive site located off the Izu Peninsula. The site features depths ranging from 5 to 30 metres, with an average depth of 15 metres. Conditions are defined by strong currents influenced by the Kuroshio Current, requiring advanced certification and careful buoyancy control. Visibility typically holds between 10 and 14 metres. Divers should remain close to the boat and monitor depth gauges closely due to the potential for rapid pressure changes. A reef hook and surface marker buoy are recommended for all dives. Water temperatures fluctuate between 16 and 25 degrees Celsius throughout the year.

Arari is a boat-accessible dive site on the Izu Peninsula featuring a combination of reef and wall topography. The site ranges from 5 to 22 metres in depth, with an average depth of 15 metres. Divers encounter moderate currents and visibility typically between 10 and 25 metres. Due to potential surge, swell, and boat traffic, this site is suited for intermediate divers. Night diving is available, offering a different perspective of the underwater terrain. Facilities including air fills, equipment rental, and showers are available nearby. Divers should remain alert for boat traffic during ascents and monitor conditions closely as surge and visibility can fluctuate.