Hi! I like to snorkel in my free time. How does snorkeling work?
You wear a mask with a tube that extends to the air so you can breathe.
So cool! So what's the point of it?
To see the ocean life you are swimming near. You can wear a wet suit to keep you warm.
That wetsuit sounds convenient. It would be awful to be uncomfortable while trying to see some beautiful reefs.  Do you know any of the history behind snorkeling?
Aristotle wrote about snorkeling in Parts of Animals.