This stunning turquoise lagoon along Queen Ka'ahumanu Highway is one of the Big Island's best-kept secrets that most tourists speed right past. The unmarked trailhead between mile markers 82-83 leads to a 15-minute hike down to pristine waters where green sea turtles practically guarantee a show. The bay sits in dramatic black lava fields, creating an otherworldly contrast with the brilliant blue water that's perfect for swimming and snorkeling. Walk south along the coast to find Queen's Bath, a hidden freshwater spring pool tucked into the lava rock. Morning visits are key — after 2pm the ocean gets rougher and turtle spotting becomes harder.
💡 Insider Tip
Go in the morning before 2pm when waters are calmest for turtle spotting. Walk right from the beach entrance and look for the small bridge area where turtles love to hang out. Bring proper shoes — flip flops struggle with the lava rock and pebbles.
Daylight hours
Free
Informal pulloff on Hwy 19
Morning for calm water and turtle sightings
