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Routes
Running trails & routes
United States
Honolulu County
Nanakuli

Mermaid Tunnels loop

Moderate

3.4

(23)

51

runners

Mermaid Tunnels loop

00:42

6.66km

70m

Running

Jog the 4.1-mile Mermaid Tunnels loop in Nānākuli Beach Park, a moderate route offering ocean views and access to the unique Mermaid Caves.

Last updated: February 26, 2026

Waypoints

A

Start point

Parking

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1

5.30 km

Mermaid Cave

Highlight • Cave

Mermaid Cave, or tunnels as it's often called, is a popular tourist destination. To get here, you walk over lava rock and go through an open hole. This cave is …

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6.66 km

End point

Parking

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Way Types & Surfaces

Way Types

4.70 km

1.82 km

106 m

Surfaces

5.10 km

1.42 km

106 m

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Elevation

Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

Highest point (70 m)

Lowest point (10 m)

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Weather

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Today

Friday 22 May

28°C

22°C

23 %

Additional weather tips

Max wind speed: 30.0 km/h

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This route was planned by komoot.

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Frequently Asked Questions

What is the difference between the 'Mermaid Tunnels loop' and the 'Mermaid Caves'?

The 'Mermaid Tunnels loop' is a designated 6.66 km jogging route, primarily on paved surfaces, suitable for all skill levels. The 'Mermaid Caves' (also known as Mermaid Tunnels) are a natural series of sea caves and lava tubes located nearby. These caves are rugged and meant for exploration, swimming, and climbing, not jogging. The loop offers a moderate running experience, while the caves require careful navigation and are not suitable for running.

Where can I park to access the jogging loop?

The jogging loop is located near Nānākuli Beach Park. You can typically find parking available in the vicinity of the park. Specific trailhead parking details may vary, so it's always a good idea to check local signage upon arrival.

Is the jogging loop suitable for beginners?

Yes, the 'Mermaid Tunnels loop' is considered suitable for all skill levels, including beginners. It's a moderate 6.66 km route with mostly paved surfaces and a manageable elevation gain of about 66 meters, making it a good option for those new to jogging or looking for a relaxed run.

How long does it typically take to jog this loop?

On average, jogging the 'Mermaid Tunnels loop' takes about 40-45 minutes. This duration can vary depending on your pace and how often you stop to enjoy the surroundings.

What is the terrain like on the jogging loop?

The jogging loop primarily features paved surfaces, making it a smooth and accessible route for running. While the nearby Mermaid Caves area is rugged with jagged lava rocks, the loop itself is designed for jogging.

What can I expect to see along the route?

While jogging the loop, you'll experience views of the ocean and mountains. The route also passes by the area of the famous Mermaid Cave, which is a unique natural feature worth exploring separately if you have time and appropriate gear.

Is the 'Mermaid Tunnels loop' dog-friendly?

Regulations regarding dogs can vary in public parks and trails in Hawai'i. It's best to check with Nānākuli Beach Park's specific rules regarding pets before bringing your dog on the loop. If dogs are permitted, they are typically required to be on a leash.

Do I need a permit or pay an entrance fee for the jogging loop or Nānākuli Beach Park?

Generally, there are no specific permits or entrance fees required to jog the 'Mermaid Tunnels loop' or to access Nānākuli Beach Park itself. However, it's always wise to check the latest information from hawaii.gov or local park authorities for any updates on regulations or fees.

What is the best time of year to jog this loop?

O'ahu generally has pleasant weather year-round. However, the best time to jog the loop is typically during the cooler, drier months from April to October. Early mornings or late afternoons are ideal to avoid the midday heat and sun, especially given the coastal location.

Are there any specific safety considerations for the jogging loop?

While the jogging loop itself is moderate and mostly paved, always be mindful of traffic if any sections are near roads. If you plan to explore the nearby Mermaid Caves, be aware that they are rugged and require caution due to jagged rocks, ocean conditions, and tides. Sturdy footwear is essential for cave exploration.

Is the 'Mermaid Tunnels loop' a good option for families with children?

Yes, given its moderate difficulty, mostly paved surfaces, and relatively short distance, the 'Mermaid Tunnels loop' can be a good option for families looking for a gentle jogging or walking experience with children. Always supervise children, especially near any coastal areas.

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