Data-driven beach plan with water quality checks
| Duration | 1 day |
| Island | Big Island |
| Beaches | 2 beaches covered |
| Best For | All experience levels |
Hapuna Beach is the Big Island’s largest white sand beach, stretching a half mile along the Kohala Coast. The sand is fine and the water is exceptionally clear, typically turquoise over the sandy bottom. The beach faces west, providing sunset views and protection from the prevailing trade winds. Summer conditions are usually calm with gentle waves; winter brings larger surf and strong shore break that has caused serious injuries. Lifeguards are on duty daily.
Water quality note: Check the Hapuna Beach page for current conditions. The dry Kohala Coast receives far less rain than the Hilo side, so water quality advisories are rare here. However, check conditions if Kona (westerly) storms have passed through recently.
A-Bay is a crescent of sand 15 minutes south of Hapuna, tucked behind ancient fishponds. The water is calmer than Hapuna during elevated surf, and the lava rock areas provide decent snorkeling among sea turtles. The palm-fringed beach faces due west for prime sunset viewing. Facilities include restrooms and a small food stand.
| Parking at Hapuna | State park lot charges $5 per vehicle for non-residents. Arrives before 10 AM on weekends to guarantee a spot |
| Best swimming time | 7–10 AM for calmest water and fewest people |
| Hapuna to A-Bay | 15 min south on Queen Kaʻahumanu Hwy (HI-19). Free parking at A-Bay lot |
| From Kona airport (KOA) | 30 min north to Hapuna, 20 min north to A-Bay |
| Important note | The Big Island is large. Beaches on the Kohala Coast are 2+ hours from Hilo. Plan your day around one coast, not both |
Reef-safe sunscreen: Required by law. The Kohala Coast is one of the driest and sunniest parts of Hawaiʻi, and sunburn happens fast. Reapply after every swim.
Snorkel gear: A-Bay has decent reef snorkeling along the lava rock edges. Bring your own gear or rent from the beach stand at A-Bay. Hapuna is more of a swimming beach (sandy bottom, less reef life near shore).
$5 cash for Hapuna parking: The state park charges per vehicle for non-residents. Have cash ready to avoid delays at the entrance booth.
Winter (November–March): Hapuna gets powerful shore break during large west and northwest swells. Check the surf forecast before going. If surf is above 3 feet, consider Spencer Beach (protected behind a reef) or A-Bay instead. Whale watching is possible from the beach — humpbacks are visible offshore December through April.
Summer (April–October): The Kohala Coast is at its best. Hapuna has gentle waves, warm 80°F water, and calm conditions most mornings. Afternoon trade winds create some chop but rarely affect swimming quality. Manta ray night snorkeling excursions operate year-round from nearby harbors.
After heavy rain, wait at least 72 hours before entering the ocean. Check each beach’s water quality page for live advisory status.
5-7 days minimum — the Big Island is huge (4,028 sq mi)
Start on the Kohala Coast (resorts), then Kona, Volcano, Hilo, and back. Do not underestimate driving distances.
Rain alternatives on Big Island: Volcanoes National Park, Hilo farmers market, Kona coffee farms, Imiloa Astronomy Center. Also check our brown water advisory guide — avoid the ocean for 72 hours after heavy rain.
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Free alerts when advisories change at your beach.
⚠️ Important Disclaimer
Safe to Swim Hawaii is an independent passion project — it is not affiliated with the Hawaii Department of Health, any entity mentioned on this page, or any government agency or hotel brand. Water quality ratings on this site are estimates based on publicly available testing data and geographic analysis. They are not real-time measurements and may not reflect current conditions.
Always verify current water quality conditions with the Hawaii Department of Health Clean Water Branch before entering the water. This site is for informational purposes only and should not be the sole basis for any swimming decisions.
This site does not recommend or advise anyone to swim at any beach. We share government data and geographic analysis so you can make your own informed decisions. By using this site you accept full responsibility for your own safety. See our Terms of Use for full details.
When in doubt, donʻt go out. 🤙