Question 1

Is the lagoon at Marriott Ko Olina safe to swim?

Accepted Answer

Yes — Ko Olina's man-made lagoons are among the safest swimming spots on O'ahu. The lagoons are protected from open-ocean waves by a rock wall, creating calm, clear conditions ideal for families and non-swimmers. Water quality is consistently excellent (Low Risk, 1/5). The lagoons are regularly monitored and maintained. Ko Olina Lagoon 4 (Kohola Lagoon) fronts the Marriott Beach Club.

Question 2

Are Ko Olina lagoons open to the public?

Accepted Answer

Yes — all four Ko Olina lagoons are public beaches under Hawaii law. Non-resort guests can access the lagoons via public parking areas (limited spaces, especially on weekends). Each lagoon has a dedicated public parking lot. The lagoons can get crowded on weekends; arrive early. Resort guests have easier access via their hotels.

Question 3

Which lagoon is at the Marriott Ko Olina Beach Club?

Accepted Answer

The Marriott Ko Olina Beach Club fronts Lagoon 4 (Kohola Lagoon), the southernmost of the four Ko Olina lagoons. It offers calm, protected swimming in a beautiful crescent-shaped cove. Lagoon 1 (Kohola) fronts the Aulani Disney Resort, and Lagoon 3 fronts the Four Seasons Ko Olina.

Question 4

What is the water quality like at Ko Olina lagoons?

Accepted Answer

Ko Olina lagoons have excellent water quality — Low Risk (1/5). The lagoons are man-made with regular water circulation from the ocean through carefully designed channels. West O'ahu's dry climate (leeward side) means minimal rainfall runoff. The DOH regularly tests Ko Olina waters and results are consistently good.

Question 5

Is Ko Olina better than Waikiki for families?

Accepted Answer

For families with young children, Ko Olina is often considered better than Waikiki beaches. The man-made lagoons are completely protected from waves, current, and surge — making them ideal for toddlers and non-swimmers. Waikiki is more convenient and has more to do nearby, but the beach has some shore break and current. Ko Olina offers a more controlled, resort-style beach experience.