If you rent a car in Kona (as we did), I highly recommend a stop at the Painted Church in Honaunau. This church is gorgeous and free to visit.
We spotted these fish from the docks at Kona. That was how clear the water was and how plentiful the fish were.
One of the experiences I love in Hawaii is swimming with the turtles. Can’t swim? Not a problem. Many turtles, like this one near Kona on the Big Island, will come close to shore. This one was so close, I almost stepped on him. I spent at least a half hour simply watching him eat.