Snorkeling in United States
Including Cocos Lagoon (Merizo), Molokini Crater, and Ritidian Point (Guam National Wildlife Refuge). On the map.
The vibe
Floating above shallow reefs feels remarkably easy, with warm tropical waters offering clear views of darting reef fish and slow-moving sea turtles. Spring through early autumn delivers the calmest surface conditions and the best underwater visibility for casual swimming. Most spots are welcoming and straightforward to visit on your own, though renting gear or hopping on a local boat tour keeps things effortless.
Cocos Lagoon (Merizo)
Guam
LittleT889 / Wikimedia Commons (CC BY 4.0)
A massive, shallow barrier reef lagoon situated off the southern tip of Guam near Merizo. The protected interior waters feature extensive sand flats, seagrass beds, and coral patches where snorkelers can spot rays, juvenile reef sharks, and diverse tropical fish.
Access. Reached via regular ferry or excursion boats from Merizo Pier to Cocos Island, where beach snorkeling and gear rentals are available.
Notes. Respect marine life and adhere to local conservation guidelines within the lagoon.
Molokini Crater, Maui
Hawaii
Farid Askerov whereisfarid / Wikimedia Commons (CC0)
This crescent-shaped volcanic caldera sits just off the coast of Maui, offering exceptionally clear water with visibility often exceeding 100 feet. Snorkelers can explore shallow coral gardens teeming with hundreds of species of vibrant reef fish and resident green sea turtles. It is one of Hawaii's premier marine life conservation districts.
Access. Accessible primarily via early morning boat charters and catamaran tours departing from Maalaea Harbor or Lahaina.
Notes. Strong winds and currents can pick up by afternoon, so morning trips are heavily recommended.
Ritidian Point (Guam National Wildlife Refuge)
Guam
Jonathan Miske / Wikimedia Commons (CC BY-SA 2.0)
Located at Guam's northernmost tip within a wildlife refuge, Ritidian boasts dramatic limestone cliffs and pristine shallow reef flats. The outer reef edge harbors vibrant hard corals and active marine life, though swimmers must respect strong currents.
Access. Shore entry from the sandy beach inside the National Wildlife Refuge. Accessible by rental car via a paved road ending at the refuge parking lot.
Notes. Strong offshore currents can occur; swimming and snorkeling are only advised during calm sea conditions. Open during refuge operating hours.
Talofofo Bay
Guam
Jonathan Miske from United States / Wikimedia Commons (CC BY-SA 2.0)
Where Guam's largest river empties into the Pacific Ocean on the rugged east coast, Talofofo Bay offers a unique mix of dark sand, river currents, and nearshore marine life where the river meets the reef.
Access. Shore access from Talofofo Bay beach park off Route 4.
Notes. Strong river outflows and ocean swells make this spot suitable for experienced visitors only when conditions are exceptionally calm; exercise caution regarding currents.
Tumon Bay
Guam
Luke Ma from Taipei, Taiwan ROC / Wikimedia Commons (CC BY 2.0)
Protected by a shallow outer reef barrier, Tumon Bay offers calm, clear waters filled with schools of colorful reef fish and harmless sea cucumbers. It's Guam's premier shore-snorkeling destination, with easy wade-in access right from the sandy beaches of hotel row.
Access. Direct shore entry from the beach. Snorkel gear is readily available for rent from various resort beach shacks and water sports operators along the bay.
Notes. Marine preserve rules apply: no fishing or taking of marine life is allowed.