We would go to the Foodland grocery store, get plate lunches or poke bowls and eat it on one of the local beaches for lunch.
+1!
I’ve lived on the Big Island for over 20 years and I can definitely recommend it for snorkeling from shore. One of the best sites is Kahalu’u Beach park in Kona. It has a life guard, free reef-safe sunscreen and knowledgeable ReefTeach personnel to provide information on the coral and marine life in this protected bay.
Anther popular shore snorkel (and dive) site is ”Two-Step” down adjacent to Pu’uhonua o Honaunau National Park.
if you wanted a day trip on a tour snorkel boat, there are several that go down to snorkel in Kealakaua Bay by the Capt. Cook Monument.
There are several more shore snorkeling spots along the Kona and Kohala coast, so you can find a really nice variet.
Add Manta Ray point at Mauna kea beach, night snorkel