Best natural monuments around Wainaku offer diverse natural features, from cascading waterfalls to serene gardens. The region, bordering Hilo, is characterized by lush tropical landscapes and significant geological formations. Visitors can explore sites that showcase the island's volcanic origins and rich biodiversity. These natural areas provide opportunities to experience Hawaii's unique environment.
Last updated: June 25, 2026
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impressive waterfall in front of a huge cave
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Observation platform with a view of the bubbling water
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From the entrance, the lava tunnel leads in two directions. The tunnel system is 2,197 meters long in total. Sturdy footwear and sufficient lighting are recommended.
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beautifully landscaped Japanese-style park with tea house and giant trees
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Rainbow (Waiānuenue) Falls is a large waterfall, measuring 80 ft (24 m) tall and almost 100 ft (30 m) in diameter. It is free to enter and see the falls because this area is part of the Hawai'i State Parks. There is no fee to see the falls. Rainbow Falls gets its name from the rainbows that show around the falls, created by the mist from the falls and the sunshine at 10:00 a.m.
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The boiling posts are sink holes with bubbling waters. For safety, it's best to stay far away from the edge of the river near Boiling Pots. Visitors are warned about the dangers of slipping and falling. The bubbling is caused by the water in the lava tubes, which are not boiling hot but give the illusion of boiling. This is a very unique thing to see, and it is highly recommended for visitors to walk down and check them out.
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Kaumana Cave is a lava tube that is free to enter. It was made by an 1881 lava flow from Mauna Loa volcano. The lava tube has been measured at just over two miles long, which ranks it as the 57th longest lava tube in the world. There is a warning sign at the entrance that indicates: "no lights, no walkways, sharp and loose rocks". Visitors should heed the warning and bring good shoes and a light.
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Visitors frequently enjoy the serene beauty of Liliuokalani Gardens, a Japanese-style park with koi ponds and bridges. Another must-see is Rainbow Falls, famous for the rainbows that often appear in its mist on sunny mornings. The expansive Wailuku River State Park, which includes attractions like the unique Boiling Pots, is also highly regarded.
Yes, several natural monuments are great for families. Liliuokalani Gardens offers spacious, tranquil grounds for walks. Rainbow Falls and Boiling Pots within Wailuku River State Park are easily accessible viewpoints that captivate all ages. Additionally, Richardson Ocean Park, just outside Wainaku, is known for its protected black sand beaches and tide pools, ideal for swimming and snorkeling with children.
The Wainaku area, bordering Hilo, is rich in diverse natural features. You'll find stunning waterfalls like Rainbow Falls and the dramatic Akaka Falls, lush tropical rainforests, and the longest river in Hawaii, the Wailuku River. There are also unique geological formations such as lava caves and the bubbling Boiling Pots, as well as serene Japanese-style gardens like Liliuokalani Gardens.
The natural monuments around Wainaku can be enjoyed year-round due to Hawaii's tropical climate. However, for the best chance to see rainbows at Rainbow Falls, visiting on a sunny morning, typically around 10:00 AM, is recommended. Generally, mornings are often clearer before afternoon showers might occur.
Yes, there are several hiking opportunities. For easy walks, consider the Liliʻuokalani Gardens Loop or the Hilo Bayfront Trail. For a more challenging experience, the Liliuokalani Gardens – Rainbow Falls loop offers a longer route. Akaka Falls State Park also features a paved loop trail through a vibrant rainforest to view the waterfalls.
Beyond hiking, you can enjoy running on various trails, such as the Coconut Island via Banyan Drive loop or the Wailuku River State Park via Haili Street route. Swimming and snorkeling are popular at Richardson Ocean Park, known for its clear waters and marine life. The Kawainui Stream Bridge area is also known for swimming in the river, though caution is advised.
Visitors particularly appreciate the tranquil atmosphere of places like Liliuokalani Gardens, with its quiet corners and beautiful landscaping. The impressive sight of Rainbow Falls cascading over a lava cave is a highlight, especially when a rainbow appears. The unique geological formations at Boiling Pots also draw considerable interest for their unusual bubbling waters.
Yes, the Wainaku Scenic Overlook provides panoramic views of Hilo Bay and the coastline from an accessible roadside stop. Liliuokalani Gardens offers paved paths throughout its expansive grounds, making it suitable for various mobility levels. Akaka Falls State Park also features a paved loop trail for viewing its magnificent waterfalls.
Given the tropical climate, it's advisable to bring light, breathable clothing, comfortable walking shoes, and rain gear as showers can occur unexpectedly. Sunscreen, a hat, and insect repellent are also recommended. Don't forget your camera to capture the stunning landscapes and waterfalls!
Yes, Liliuokalani Gardens is a significant cultural site, designed in Edo-style as a tribute to Hawaii's first Japanese immigrants. The gardens feature traditional Japanese elements like pagodas and a teahouse. Additionally, the cave beneath Rainbow Falls is connected to ancient Hawaiian legends of the goddess Hina, adding a layer of folklore to its natural beauty.
Richardson Ocean Park, located just a short drive from Wainaku, is well-known for its beautiful black sand beaches. It's a popular spot for swimming and snorkeling, offering protected coves and tide pools to explore marine life.
The Wainaku Scenic Overlook is an accessible roadside stop offering panoramic views of Hilo Bay and the surrounding coastline. It's a convenient spot for a quick scenic appreciation of the area, and at night, it provides a captivating glimpse of Hilo's city lights.


Extend your search for the best caves by checking out these guides of the top ones around Wainaku: