My favorite thing to do (and I say this all the time) is teaching people how to paddle board for the first time.
It creates people addicted to paddle boarding! You get to learn a new sport that is easy and helps you explore like no other sport. Even with kayaking, your view-point is so much different than standing up on a board and seeing all that is around you.
Check out the photos from our June 3rd class. (keep in mind, I like to keep these classes very small – 3-5 people)