South Kona
The best shore snorkeling on the Big Island and one of the finest in Hawaii — a natural two-step lava entry drops directly into 30–50 foot visibility water with exceptional coral coverage and fish density. Spinner dolphins rest in the bay in the mornings; manta rays pass through occasionally. The lack of a sandy beach means the water is completely clear of sediment. Combine with Puʻuhonua o Hōnaunau next door: visit the cultural site, then cool off in the bay. Look underwater near the boat mooring area for the word "ALOHA" spelled out in coral and stones.
Free, no reservation. Located on Hwy 160 directly beside Puʻuhonua o Hōnaunau NHP — look for the small dirt parking area just before the park entrance. No facilities on-site. Gear rental from Snorkel Bob's or equipment shops in Kailua-Kona (~20 min north).
Calm and swimmable year-round — south Kona is protected from north and east swell. Morning for best dolphin sightings and clearest water. Avoid if white caps visible offshore.