The San Guglielmo is a 1st class passenger ship launched in 1911 that served as a troop transport before being sunk by a submarine in 1918. Located 850 metres from shore in the Portofino Marine Park, the wreck rests on a sandy bottom at a maximum depth of 29 metres, with an average depth of 28 metres. This intermediate-level dive requires boat access. Divers should be aware of hazards including the depth, potential for entanglement, and nitrogen narcosis. Visibility at the site ranges from 1 to 15 metres, and water temperatures fluctuate between 14C and 19C throughout the year.

Secca delle stelle is a reef located 500 metres offshore within the Portofino Marine Park. The site sits at depths between 13 and 25 metres, with an average depth of 19 metres. Divers experience mild currents and visibility ranging from 10 to 30 metres. Due to the proximity of vessel traffic, the use of a surface marker buoy is essential during all ascents and descents. The site is suitable for beginners and offers year-round diving, including night dives. Guided tours, equipment rental, and air fills are available locally to assist with site navigation and logistics.

Secca di Marassi is a prominent reef and wall dive site located 900 metres offshore within the Portofino Marine Park. The site features a large, jagged formation with a minimum depth of 23 metres and a maximum of 36 metres, averaging 30 metres. Divers encounter a wall rising approximately 10 metres on the south-west side, while the north-west side presents a gentle slope. Due to the depth and moderate currents, this site is reserved for advanced divers. Access is strictly by boat. Water temperatures range from 14C to 18C throughout the year. Hazards include the depth, potential for entanglement, and strong currents.

Punta Sciuscia is a reef dive located 600 metres offshore within the Portofino Marine Park. The site features a rocky topography with crevices and overhangs, ranging in depth from 13 to 28 metres with an average of 20 metres. Access is strictly by boat. Visibility typically ranges between 5 and 10 metres, requiring divers to focus on the reef structure. While conditions are generally mild, currents can strengthen, and divers should remain vigilant regarding entanglement hazards from debris. Night diving is permitted at this location. The site is suited for intermediate divers due to the potential for variable currents and the need for careful buoyancy control near the reef.

Punta Sciusciau in the Portofino Marine Park offers a diverse underwater profile featuring a reef, wall, and wreck. Divers can explore depths ranging from 15 to 40 metres, with an average depth of 25 metres. The site is accessible only by boat and is suited for intermediate divers due to moderate currents and the depth profile. Visibility typically ranges between 10 and 25 metres. Water temperatures remain between 14 and 17 degrees Celsius throughout the year. Divers should remain aware of boat traffic when surfacing and maintain buoyancy control to avoid contact with sharp coral and rocks. Species recorded around this area include Mediterranean moray, great barracuda, wrasses, various nudibranchs, and soft corals.

Isola Gallinara, located within the Portofino Marine Park, offers a diverse underwater environment featuring reefs, walls, and an 18th-century wreck. Divers must access the site by boat, as it lies 1500 metres from the shore. The site reaches depths between 15 and 30 metres, with an average of 25 metres. Conditions include moderate currents and water temperatures ranging from 14C to 19C. Due to the presence of unexploded ordnance and the historic wreck, diving is restricted to those accompanied by local authorised guides. Hazards include entanglement, sea urchins, and strong currents. Species recorded around this area include Mediterranean moray, great barracuda, various nudibranchs, and bream.

Cristo degli Abissi is a notable dive site located within the Portofino Marine Park. The site features a combination of natural reef and wall topography, highlighted by the iconic underwater statue of Christ. Divers typically access the site by boat, located 1500 metres from the shore. Depths range from 18 to 30 metres, with an average depth of 20 metres. Visibility at the site generally fluctuates between 10 and 20 metres. Due to the depth and potential for strong currents, decompression and nitrogen narcosis are noted hazards. The site is suitable for experienced divers, with typical dive times lasting around 45 minutes.

Punta Falconara is a wall and artificial reef site located within the Portofino Marine Park. Accessible only by boat, the site features a wall that drops from 18 to 38 metres, with an average depth of 22 metres. Conditions include mild currents and variable visibility, making it essential to check local conditions before departure. The site is suitable for beginners, though snorkelers should remain aware of the significant depth and potential boat traffic at the surface. Sharp rock is present along the wall, requiring caution during entry and exit. Water temperatures fluctuate seasonally between 14C and 26C.