Hawaii Island (The Big Island)

Mantas are present year-round on the Kona coast. Encounters depend on plankton, not a strict season. Calmer seas and warmer water often occur September to November, but guided night dives operate in all months. Two main manta sites are Garden Eel Cove near the airport and Keauhou Bay to the south. Book with permitted operators, follow guide briefings, and keep hands off the animals at all times.

Blackwater is a guided, advanced night drift over deep ocean. You will be tethered beneath the boat with lights to view planktonic life. Good buoyancy, night comfort, and situational awareness are essential. Operators run small groups and provide procedures and gear. If you are new to night diving, do a reef night dive first, then try blackwater with an experienced crew.

Water temperatures typically range around 24°C to 27°C. Most divers use a 3 mm full suit year-round, with a hooded vest or 5 mm for those who chill easily, especially on repeated night dives. Snorkelers are comfortable in a 2-3 mm shorty or rashguard set. Booties are recommended for lava-rock shore entries.

Choose protected coves with easy entries and go early before winds build. Popular choices include Kahaluʻu Beach Park and guided boat trips to calm leeward bays. Avoid brown water after rain and skip days with significant swell or surge at lava benches. Consider a snorkeling vest for comfort and always give turtles at least 3 m of space.

You can reach the bay by permitted commercial boat tours or by hiking the Kaʻawaloa Trail. Commercial landings and vessel operations in the Marine Life Conservation District follow specific rules. Do not feed fish or touch coral. Launch only at designated locations and respect closures or permit requirements that protect the bay.

Follow NOAA guidance: keep at least 3 m from sea turtles, 15 m from monk seals on land or in water, 46 m from spinner dolphins, and 91 m from humpback whales. Never chase, touch, or block animals' paths. Report injured or harassed wildlife to the statewide hotline at 888-256-9840.

Kīlauea's activity has been intermittent. If erupting, lava may be visible within the park, but vog can degrade air quality. Sensitive groups should limit exertion during poor air days. Always check USGS daily volcano updates and the Hawaiʻi Interagency Vog Dashboard before visiting and follow park advisories on closures and viewing safety.

Yes for most itineraries. Dive marinas, shore sites, and topside attractions are spread out. Rideshare exists in Kona and Hilo but coverage is variable. The Hele-On bus has limited schedules. Book rental cars early in high season, and allow extra time for airport pickups and returns at KOA.

Expect national park entrance fees for Hawaiʻi Volcanoes National Park and some state park day-use fees at popular beaches. Commercial ocean operators collect a USD $1 Hawaii Ocean Stewardship fee per passenger that supports statewide conservation. Your tour confirmation will include any added fees or taxes.

In Kailua-Kona, long-standing operators include Jack's Diving Locker, Big Island Divers, and Kona Honu Divers. They run two-tank manta evenings, manta night snorkels, and advanced blackwater drifts with trained crews and established safety protocols. Book early for peak periods.