Los Arcos National Park features a diverse underwater landscape of reef and cave structures. Divers can explore depths ranging from 6 to 36 metres, with an average depth of 15 metres. Access is strictly by boat to avoid the shore break, and the site is suitable for beginners, though conditions vary. Visibility typically ranges between 6 and 15 metres. Currents can be strong and variable, and divers should remain alert for boat traffic and surge. Night diving is available at this location. Due to the shifting currents and potential for surge, it is recommended to brief thoroughly with a guide and confirm exit points before entry.

Camion hundido in Los Arcos National Park is a shallow shore-entry dive site located near Puerto Vallarta. The site features a consistent depth of 3 metres, providing a calm environment suitable for new divers to practise buoyancy. Conditions are generally mild with visibility ranging from 5 to 10 metres. Water temperatures fluctuate between 24 and 30 degrees Celsius throughout the year, typically requiring only a thin wetsuit or skin suit. As a shore-entry location, it offers an accessible experience without the need for boat transport. Divers should confirm local access points and bring their own equipment and supplies before arrival.

Punta Mismaloya in Los Arcos National Park offers a diverse underwater environment featuring natural reef, artificial reef structures, a wreck, and a drop-off reaching 40 metres. With an average depth of 18 metres, the site is suitable for beginners, though divers should monitor their depth carefully near the drop-off. Visibility ranges from 5 to 10 metres, and water temperatures fluctuate between 21 and 29 degrees Celsius. Access is available via boat or shore, with the latter requiring navigation through a surf zone. Divers should be aware of potential strong currents, boat traffic, and sharp coral. On-site facilities include parking, a cafe, and equipment rental.

Las Gemelas Beach, located within Los Arcos National Park, features two identical beaches divided by a prominent rocky outcropping. This reef site offers a shallow environment suitable for beginners, with depths ranging from 1 to 12 metres and an average depth of 6 metres. Divers and snorkellers access the reef directly from the shore. Conditions vary, with visibility typically between 5 and 15 metres and moderate currents. Facilities at the site include parking, toilets, showers, changing rooms, and a rinse station. Equipment rental, air fills, and guided tours are available through the on-site dive shop and boat charter services. Be aware of potential hazards including jellyfish and rip currents.

The Princesa Vallarta is a shipwreck resting approximately 200 metres from the shore. This site offers a varied depth profile ranging from 12 to 41 metres, with an average depth of 20 metres. Access is strictly by boat. Divers should be aware of the overhead environment and potential for entanglement, as well as risks associated with deep diving, nitrogen narcosis, and mild currents. Visibility fluctuates significantly between 7 and 30 metres. The site is suitable for advanced divers due to the depth and technical nature of the wreck. Night diving is permitted at this location.

Colomitos Beach is a sheltered inlet within Los Arcos National Park, recognised as one of the smallest beaches in Mexico. The site features a reef environment suitable for beginners, with water temperatures ranging from 24C to 30C throughout the year. Divers and snorkellers can access the site from both the shore and by boat. The topography consists of a small beach leading into calm waters, with rocky edges providing the primary structure for the reef. Visitors should be aware of sea urchins present in the area. The site is well-regarded for snorkelling, offering a sheltered environment for underwater exploration.

Conchas Chinas consists of a series of small coves located south of the Romantic Zone in Puerto Vallarta. The site features natural rock formations that create sheltered pools, providing a shallow environment suitable for shore-based snorkelling. Depths at this reef site range from 1 to 5 metres, with an average depth of 3 metres. Conditions are generally mild, though visitors should be aware of potential surf near the shore. Visibility typically ranges between 8 and 15 metres. Parking is available for those accessing the site from the coast. It is well-suited for beginners looking for a relaxed snorkelling experience.

Quimixto Rocky Edge is a reef site located in Los Arcos National Park, accessible only by boat. The site features a varied underwater topography along the eastern rocky edge of the beach. Conditions at this location are variable, and snorkelers should be aware of potential hazards including sharp coral and surf. Water temperatures range from 24C to 30C throughout the year. The site is suitable for beginners and offers a snorkel rating of 3 out of 5. Facilities available in the area include a cafe and guided tours.