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?
Snorkeling
Snorkeling (British and Commonwealth English spelling: snorkelling) is the practice of swimming on or through a body of water while equipped with a diving mask, a shaped breathing tube called a snorkel, and usually swimfins. In cooler waters, a wetsuit may also be worn. Use of this equipment allows the snorkeler to observe underwater attractions for extended periods with relatively little effort and to breathe while face-down at the surface.
Snorkeling is a popular recreational activity, particularly at tropical resort locations. The primary appeal
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Snorkel.
A snorkel is a device used for breathing air from above the surface when the wearer's head is face downwards in the water with the mouth and the nose submerged. It may be either separate or integrated into a swimming or diving mask. The integrated version is only suitable for surface snorkeling, while the separate device may also be used for underwater activities such as spearfishing, freediving, finswimming, underwater hockey, underwater rugby and for surface breathing with scuba equipment. A swimmer's snorkel is a tube