Snorkeling is probably one of my favorite recreational activities to do! 
I have never snorkled before.  Can you tell me more about it?
Definitely! To start, you'll need a diving mask and a breathing tube, called a snorkel. You may even want a wetsuit.
When did snorkeling become popular?  Has it been around a long time?
I'm actually not sure, but snorkeling has been mentioned by Aristotle, so at the very least, it goes back to Aristotle's time.
Wow, that is pretty far back.  What else interesting do you know about the activity?
Well, the nice thing about snorkeling is that it gives you the opportunity to view underwater life without using expensive scuba gear.
I would imagine it is much cheaper than scuba.  Does it take a lot of training?
It doesn't need particular training, but it's good to know how to swim well.
I would imagine.  I bet it is a very fun activity to do