Option Tour Guide
This product is designed for customers who visit the site directly using a rental car that does not include hotel pick-up service.
Round-trip shuttle service is available for an additional fee:
Adults $15, Children $5, Infants: Free.
This is the only underwater observatory in Micronesia, located 9 meters below sea level.
From the wooden pier connected to the observatory, which stretches for about 10,000 steps, you can enjoy beautiful coral reefs and tropical fish swimming beneath the clear waters.
In the late afternoon, you can also enjoy Guam’s beautiful and breathtaking sunset.
On the upper floor of the underwater observatory, you can enjoy a 360-degree panoramic view of the ocean, distant coral reefs, and the beautiful mountains of Guam.
The facility is air-conditioned, and various marine art exhibits are displayed on the upper level.
If you walk down the spiral staircase, you will reach the underwater viewing area where you can observe divers feeding more than 200 species of tropical fish and admire the coral garden through 24 large viewing windows.
You can also enjoy a special Coconut Experience, where you can learn about the local culture from native island residents.
At the tropical-style restaurant, you will have the opportunity to taste fresh coconut juice and coconut products, and you may also take selfie photos with the local residents.

Basic Course Schedule (Open Tour)
Start Time
09:20 / 10:20
Briefing
09:20–09:30 / 10:20–10:30
Coconut Experience & Dessert Tasting (50 minutes)
09:30–10:20 / 10:30–11:20
Underwater Observatory Visit (40 minutes)
10:20–11:00 / 11:20–12:00
Tour End
11:10 / 12:10

Please select your preferred arrival time and arrive around that time.
Upon arrival, simply present your reservation number at the entrance of the Underwater Observatory.