Chaikou Snorkelling Area on Green Island features a shallow reef ranging from 1 to 10 metres in depth, with an average of 5 metres. This site is suitable for beginners, offering mild currents and visibility between 10 and 25 metres. Shore entry requires caution due to sharp coral, rocks, and sea urchins near the waterline; reef shoes or booties are strongly recommended. Snorkellers should time their entry to avoid the shore break. Water temperatures remain between 25 and 30 degrees Celsius. Hazards include stonefish on the seafloor and jellyfish in the water. Facilities include parking and a rinse station.

Zhongliao Port on Green Island, Taiwan, offers a shallow reef and muck diving environment suitable for beginners. Divers typically experience depths of 5 metres with mild currents and visibility ranging from 10 to 30 metres. Shore entry is standard for this site. Marine life recorded here includes wrasses, Indian lionfish, snowflake moray, and various nudibranchs such as Nembrotha and Trance Wrinkle Dorid. Other species observed include Ijima's sea snake, semicircle angelfish, striped surgeonfish, banded coral shrimp, porcupinefish, white-spotted puffer, and yellow boxfish. Hazards to consider include potential entanglement, variable visibility, and surf conditions. Typical dives last approximately 40 minutes.

Dory Reef is an offshore reef located 1000 metres from Green Island, Taiwan. The site features reef terrain ranging from 15 to 33 metres in depth, with an average depth of 17 metres. Divers must access this location by boat. Conditions include moderate currents that can shift with little warning, requiring divers to be comfortable with drift diving and buoyancy control. Visibility is typically between 20 and 40 metres. Due to the exposed nature of the site, surface conditions such as surge and swell can change quickly. Divers should coordinate closely with their boat operator and divemaster regarding current strength and pickup arrangements before entry.

Yixiantian, located off Green Island, is a reef site defined by a narrow channel that funnels strong currents. This topography requires advanced skills in buoyancy and current management. Divers can explore depths reaching 50 metres, with boat access required for all entries. The reef walls host various marine life, including wrasses and snails, which are common. Divers may also encounter emperor angelfish, clown triggerfish, redtooth triggerfish, nembrotha nudibranchs, elongate clams, chromis, and sea squirts. Given the channel geometry, current direction and strength vary significantly, making it essential to consult with a local dive operator regarding conditions before entry.

The Back Garden (Lighthouse) site is a reef location situated off Green Island, Taiwan. This site is suitable for beginner divers, offering a consistent average depth of approximately 9 metres. Conditions at this location vary, with water temperatures ranging from 25C to 30C throughout the year. As a reef environment, the topography is defined by its coral structures. Divers should be prepared for variable conditions typical of this marine area. Access to the site is generally managed via boat, providing a straightforward experience for those developing their diving skills in a reef setting.

Jichang Fault is a dramatic underwater landscape situated on the outer edge of the Green Island reef system. This site is defined by its geological fault line, which has created a complex topography of walls, canyons, and drop-offs reaching depths of 46 metres. With an average depth of 30 metres, this site is suited for advanced divers. Visibility ranges from 15 to 40 metres, allowing for clear views of the structural features. Strong currents are a constant factor, requiring drift-diving experience and precise buoyancy control. Access is by boat only, and divers should time their entry to coincide with slack water to safely explore the deeper sections.

Big Mushroom is a reef and artificial reef site located 165 metres off Green Island, Taiwan. The site features a depth range of 2 to 19 metres, with an average depth of 19 metres. Divers experience visibility between 15 and 30 metres and water temperatures ranging from 25 to 29 degrees Celsius. The site includes swim-through sections and requires boat access. Due to moderate currents and potential hazards such as sharp coral, rocks, and surf, a local guide is recommended. Divers should maintain awareness of surface boat traffic during ascents and manage buoyancy to avoid entanglement in the overhead environment.

Clownfish Island is a reef site located off Green Island, Taiwan. The site offers depths typically ranging between 12 and 15 metres, with an average depth of 13 metres. Divers can expect mild currents and visibility generally between 20 and 30 metres. Entry to the water is possible from both shore and boat. The site is suitable for intermediate divers. Water temperatures fluctuate throughout the year, ranging from 25C in the winter months to 30C in July. Divers should be aware of sharp coral present in the area.