Los Arcos National Marine Park — three towering granite arches and a colony of underwater pinnacles 10 km south of Puerto Vallarta — is the best half-day snorkel and dive trip in Banderas Bay. A federal marine sanctuary since 1984, it shelters 100+ fish species, green sea turtles, octopus, seasonal manta rays and humpbacks. Group boat tours run $40 to $70 in 2026, dive trips $90 to $140. This guide covers what you actually see, the operators worth booking, and how the half-day fits into a Vallarta itinerary.
Why Los Arcos
Three reasons. First, geology — three granite islets that rise dramatically out of the bay with sea-cave tunnels you can swim through. Second, marine life — an exclusion zone since 1984 has rebuilt fish populations to densities you do not see further north along the Mexican Riviera. Third, accessibility — 25 minutes by boat from the Vallarta Marina, half-day trip, no permit hassle.
Tour Pricing in 2026
| Tour Type | 2026 Price (USD) | Duration | Includes |
|---|
| Group snorkel tour | $40–$60 | 4 hours | Gear, guide, fruit and water |
| Premium snorkel + Mismaloya | $55–$80 | 5 hours | Plus beach lunch stop |
| Two-tank dive (PADI) | $120–$150 | 5 hours | All gear, 2 dives, snacks |
| Resort discover-dive | $100–$140 | 4 hours | Pool intro + 1 ocean dive |
| Private 6-pax boat charter | $420–$680 | 5 hours | Captain, snorkel gear, beer |
| Glass-bottom boat (no swim) | $25–$40 | 2 hours | Sightseeing only |
🧮
Mexico Trip Cost Calculator
Build a Vallarta water-day plan that pairs Los Arcos with Marietas Islands and whale-watching season.
Snorkel vs Dive — Which Is Right?
Snorkeling is the right call for most travelers. The arches are shallow (2 to 8 m at the snorkel sites) with strong sun penetration, so visibility is often better at the surface than at depth. The Devil's Canyon (Cañón del Diablo), a 50 m underwater wall, is the dive-only highlight — drop-off coral, schooling jacks, the occasional eagle ray. Certified divers should book a two-tank trip; everyone else is fully served by snorkeling.
Top Operators
- Vallarta Adventures: The biggest, slickest operator. Boats up to 50 pax, professional but commercial. $55 to $70.
- Wildlife Connection: Smaller boats (12 to 18 pax), marine biologist guides. $60 to $75. Best for nature focus.
- Banderas Bay Charters: Private 6 to 12 pax catamarans, $420 to $680 per boat. Best value for groups of 4+.
- Diana's Tours: Lower-budget shared boat from Mismaloya pier, $40, no frills.
- Pacific Scuba PV: Best dive shop, two-tank $130 with all-included gear.
- Banderas Scuba Republic: Highly-rated dive operator, small groups, $140.
What You Will See Underwater
- Green sea turtles: Year-round, especially around the south arch.
- King angelfish, parrotfish, Moorish idols, schooling sergeant majors: Constant residents.
- Octopus and moray eels: Tucked into arch crevices.
- Pacific manta rays: Seasonal (December to April), dramatic at depth.
- Humpback whales: Heard underwater December to March; sometimes seen on the boat ride out.
- Bioluminescent plankton: Rare night dives reveal the bay's lit-up plankton — only with specialty operators.
When to Go
Best months are November through April — calm seas, water 24 to 27 °C, 12 to 18 m visibility. May through October has rougher afternoons and 10 m visibility but warmer 28 to 30 °C water and excellent fish density. Always book the morning departure: by 1 p.m. the bay swell picks up and visibility drops by half.
Two things to skip. First, "free pickup" tours from Hotel Zone — they tack on a 90-minute timeshare pitch. Always check reviews. Second, avoid solo kayaking from Mismaloya in afternoon — wind shifts can leave you struggling against a 15-knot southerly.
How to Combine With a Vallarta Day
- Morning: 8:30 a.m. tour pickup, 10 a.m. arrival at the arches, 11 to 12:30 in the water.
- Lunch: Mismaloya beach palapa restaurant ($10 to $15 a plate) — included on premium tours.
- Afternoon: Back at the marina by 2 p.m. — perfect timing for a Malecón sunset walk.
- Pair with: Marietas Islands the next day for a contrasting (rougher, longer, biosphere) boat trip.
Los Arcos National Marine Park — three towering granite arches and a colony of underwater pinnacles 10 km south of Puerto Vallarta — is the best half-day snorkel and dive trip in Banderas Bay. A federal marine sanctuary since 1984, it shelters 100+ fish species, green sea turtles, octopus, seasonal manta rays and humpbacks. Group boat tours run $40 to $70 in 2026, dive trips $90 to $140. This guide covers what you actually see, the operators worth booking, and how the half-day fits into a Vallarta itinerary.
Why Los Arcos
Three reasons. First, geology — three granite islets that rise dramatically out of the bay with sea-cave tunnels you can swim through. Second, marine life — an exclusion zone since 1984 has rebuilt fish populations to densities you do not see further north along the Mexican Riviera. Third, accessibility — 25 minutes by boat from the Vallarta Marina, half-day trip, no permit hassle.
Tour Pricing in 2026
| Tour Type | 2026 Price (USD) | Duration | Includes |
|---|
| Group snorkel tour | $40–$60 | 4 hours | Gear, guide, fruit and water |
| Premium snorkel + Mismaloya | $55–$80 | 5 hours | Plus beach lunch stop |
| Two-tank dive (PADI) | $120–$150 | 5 hours | All gear, 2 dives, snacks |
| Resort discover-dive | $100–$140 | 4 hours | Pool intro + 1 ocean dive |
| Private 6-pax boat charter | $420–$680 | 5 hours | Captain, snorkel gear, beer |
| Glass-bottom boat (no swim) | $25–$40 | 2 hours | Sightseeing only |
🧮
Mexico Trip Cost Calculator
Build a Vallarta water-day plan that pairs Los Arcos with Marietas Islands and whale-watching season.
Snorkel vs Dive — Which Is Right?
Snorkeling is the right call for most travelers. The arches are shallow (2 to 8 m at the snorkel sites) with strong sun penetration, so visibility is often better at the surface than at depth. The Devil's Canyon (Cañón del Diablo), a 50 m underwater wall, is the dive-only highlight — drop-off coral, schooling jacks, the occasional eagle ray. Certified divers should book a two-tank trip; everyone else is fully served by snorkeling.
Top Operators
- Vallarta Adventures: The biggest, slickest operator. Boats up to 50 pax, professional but commercial. $55 to $70.
- Wildlife Connection: Smaller boats (12 to 18 pax), marine biologist guides. $60 to $75. Best for nature focus.
- Banderas Bay Charters: Private 6 to 12 pax catamarans, $420 to $680 per boat. Best value for groups of 4+.
- Diana's Tours: Lower-budget shared boat from Mismaloya pier, $40, no frills.
- Pacific Scuba PV: Best dive shop, two-tank $130 with all-included gear.
- Banderas Scuba Republic: Highly-rated dive operator, small groups, $140.
What You Will See Underwater
- Green sea turtles: Year-round, especially around the south arch.
- King angelfish, parrotfish, Moorish idols, schooling sergeant majors: Constant residents.
- Octopus and moray eels: Tucked into arch crevices.
- Pacific manta rays: Seasonal (December to April), dramatic at depth.
- Humpback whales: Heard underwater December to March; sometimes seen on the boat ride out.
- Bioluminescent plankton: Rare night dives reveal the bay's lit-up plankton — only with specialty operators.
When to Go
Best months are November through April — calm seas, water 24 to 27 °C, 12 to 18 m visibility. May through October has rougher afternoons and 10 m visibility but warmer 28 to 30 °C water and excellent fish density. Always book the morning departure: by 1 p.m. the bay swell picks up and visibility drops by half.
Two things to skip. First, "free pickup" tours from Hotel Zone — they tack on a 90-minute timeshare pitch. Always check reviews. Second, avoid solo kayaking from Mismaloya in afternoon — wind shifts can leave you struggling against a 15-knot southerly.
How to Combine With a Vallarta Day
- Morning: 8:30 a.m. tour pickup, 10 a.m. arrival at the arches, 11 to 12:30 in the water.
- Lunch: Mismaloya beach palapa restaurant ($10 to $15 a plate) — included on premium tours.
- Afternoon: Back at the marina by 2 p.m. — perfect timing for a Malecón sunset walk.
- Pair with: Marietas Islands the next day for a contrasting (rougher, longer, biosphere) boat trip.