Years and years ago I tried snorkeling. It didn't take. Never figured out the whole breathing thing.
This time around we chartered a trip to snorkel at the coral reefs in Captain Cook Bay (https://en.wikipedia.org/wiki/Kealakekua_Bay). Our captain gave us all a five minute lesson and that made all the difference in the world. I could do that a lot. Here are some pictures I took.
Be good, have fun,
Later in the week I snorkeled near the resort and came across a sea turtle. There are parts of this video where the current brought me too close to dude, you should keeps some space for their protection (and yours).