Kealakekua Bay (where Captain Cook Memorial is) is a fantastic snorkeling spot, you'll like that. You'll probably be greeted by dolphins when you get there. The entrance to that bay is where some houses had to be sunk by the coast guard back in March since they had been swept off their foundations (thankfully only the houses were casualties in that), I guess it drops off very quickly and they are now sitting in 300' depth.
When I was there it was raining tonnes (not the in the bay itself but nearby) and the rocks on shore were literally weeping with freshwater and consequently there was a lot of intermix occlusion near the surface (had this in most snorkel spots when I was there), just had to dive down under it but when you're snorkeling you run out of air quicker
.. Love snorkeling still but it's one more reason I want to do more diving from now on - get under that surface mixing layer and stay under long enough to see stuff!
I don't have my ticket yet. Actually this trip was supposed to be where I could do my open water but that winter cold that pretty much dropped me to the ground unfortunately meant that had to be canceled.
Oh well, a reason to go back some other year I guess.
Looking forward to more pics.