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Big Island: 1-Hour Eco-Friendly Glass Bottom Reef Tour

5 Reviews
ToursCruises & Boat ToursWater SportsBoats & YachtsChildren's ActivitiesFamily-friendlyTheme ToursGroup ActivitiesFamily-friendly ActivitiesMedium-risk activities

Cruise along the coastline of Kailua Bay, hovering within inches of the coral reef. Enjoy a lively narration by a marine naturalist as you take in the beauty above and below the ocean’s surface. This eco-tour is fun for all ages!


  • Head out for an eco-tour on a comfortable glass bottom boat!
  • Glide within inches of the coral reef
  • Learn about the vibrant tropical fish, coral colonies, and other underwater wonders


Step aboard Marian, a unique glass-bottom boat. Enjoy the comfortable and a spacious cruiser that will take you on an exciting journey exploring Kona's fantastic reef. Your tour begins as you board the vessel at Kailua Pier. Onboard naturalists share their love of the sea as you cruise over the reef. See and learn about the vibrant tropical fish, coral colonies, and other underwater wonders. Have your camera ready as the boat approaches Shipwreck Rock, so named because most ships or boats would stay clear of it. The Marian was custom-made to glide right over the rock, making for unique photo opportunities. finally, head out to the drop off where you see the bottom plunge to over 100 feet deep. Look for frolicking dolphins, or even whales.


Naturalist guide onboard Coral reef and wildlife information

Important Information

  • While parts of the Big Island are unfortunately affected by the volcano eruption, business is still operating and safely conducting tours

Easy cancellation

Cancel up to 24 hours in advance to receive a full refund

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