Ko Olina is a resort community on Oahu’s west coast — quieter than Waikiki, more spread out, and built around four sheltered lagoons that most people don’t know much about before they arrive.
The lagoons are open to the public, free to use, and calm enough for young children.
If you’re staying in Ko Olina, or thinking about a day trip from Waikiki, here’s what you need to know.
How the Lagoons Were Built
Ko Olina Resort was once part of sugarcane plantations.
The coastline was rocky and exposed — not the kind of place you’d spread out a beach towel.
That changed in the 1980s, when a developer purchased the land with backing from Japanese investors and built the four lagoons from scratch.
By the early 1990s, he had completed the lagoons, the golf course, and one hotel. When Japan’s bubble economy collapsed, development stopped but a new developer took over in 1998 and built out the rest into what Ko Olina is today.
Lagoon Basics: Hours, Access & Rules
All four lagoons are open to the public from sunrise to sunset. There are no lifeguards on duty, so guests swim at their own risk. Admission is free.
The lagoons are privately owned, but public pedestrian access to the beaches is required under the terms of Ko Olina’s development agreement with the state. You’re welcome to use the beach — just not the resort chairs or umbrellas, which are reserved for hotel guests.
Parking
Public parking at Ko Olina is free, available from sunrise to sunset on a first-come, first-served basis.
Lagoon 4 has the largest public lot — around 100 stalls — and is the most practical option if you’re visiting for the day.
Lagoons 1 and 2 have smaller lots that fill up quickly, especially on weekends.
On weekends and holidays, and during sunset hours, the lots tend to fill up.
Arriving before 9am or early in the afternoon is your best bet.
The map below shows the Lagoon 4 public parking lot — the easiest option for day visitors.
The Four Ko Olina Lagoons
Each lagoon has a name and a slightly different character, though the water conditions are similar across all four.
Lagoon 1 — Kohola Lagoon
The largest lagoon, home to both the Four Seasons and Aulani Disney Resort. It’s the most well-known and tends to be the busiest, particularly on weekends when Aulani is at capacity.
Lagoon 2 — Honu Lagoon
Where the Beach Villas at Ko Olina are located — a vacation rental condo complex sitting directly on the lagoon.
Despite being centrally positioned, it’s consistently one of the quieter lagoons.
Learn more about Beach Villas at Ko Olina →
Lagoon 3 — Nai’a Lagoon
Home to the Marriott Ko Olina Beach Club. Similar in size and feel to Lagoon 2, with a slightly more resort-heavy atmosphere.
Lagoon 4 — Ulua Lagoon
The only lagoon without a resort. It has the largest public parking lot and is typically the quietest of the four — a good choice if you’re coming for the day and want space to settle in without navigating resort grounds.
What to Do at the Lagoons
Swimming
This is what the lagoons were built for. The stone walls block ocean swells, so the water stays flat and calm even when conditions outside are rough. It’s safe for young children, non-swimmers, and anyone who finds open-ocean beaches too unpredictable.
Snorkeling
You can snorkel in the lagoons. Fish tend to gather near the rocks at the edges and around the openings where the lagoon meets the ocean. Don’t expect a reef — these are man-made — but it’s calm enough to explore at your own pace.
Bring your own mask and fins; there’s no rental on the beach.
For coral and more open-water marine life, the Ko Olina Catamaran Sail and Snorkel with Lunch takes you out beyond the lagoon walls.
Ko Olina Catamaran Sail and Snorkel with Lunch
SUP and kayaking
The calm water makes the lagoons ideal for stand-up paddleboarding and kayaking. Check with your accommodation about rental options nearby, as availability varies.
Watching the sunset
Ko Olina sits on the west coast of Oahu, which means the sun sets directly over the water. From the lagoon beaches, the view is unobstructed. Early evening at Lagoon 4 — away from the resort crowds — tends to be the best spot to watch it.
To watch the sunset from the water, the Ko Olina Glass Bottom Sunset Tour takes you out along the west coast — with views of the coastline and, on clear evenings, the neighboring islands.
Ko Olina Glass Bottom Sunset Tour
Planning a trip to Ko Olina? Ko Olina Travel Guide covers getting there, sunsets, and what to expect. For dining and groceries, see Where to Eat in Ko Olina. If you’re considering staying on the lagoon, read our Beach Villas at Ko Olina review.