Wailuku River State Park

On some mornings, sunlight and mist create rainbows at Rainbow Falls.

Water cascades into deep blue pools at Rainbow Falls.

A lookout at Wailuku River State Park offers a view of the Boiling Pots.

Wailuku River State Park, off Waianueue Avenue in Hilo, offers fascinating geologic and scenic features.

From a lookout, waters can be seen roiling and bubbling over the Boiling Pots, a succession of big pools connected by underground cascades. This area is located at the end of Peepee Falls Drive.

Rainbows sometimes form on misty mornings at 80-foot Rainbow Falls, on Rainbow Drive. Hawaiians call the falls "waianuenue," which means "rainbow seen in water."

Hina, mother of the deity Maui, is said to have dwelled in a cave behind the cascade.