Sure, I'll surf, but for whatever reason I'm just not very comfortable in the open ocean, farther than a swim from shore. I'm not a big fan of snorkeling, and the thought of scuba diving creeps me out.
But I'll snorkel, reluctantly, and usually after a beer, even as creepy as I find the experience.
Finally adorn with all the gear that I need, slathered up with sunscreen and one of those new expensive full-face snorkel masks purchased just for this experience, on the one-count of 3-2-1, this friend shows up to circle the boat.