Really felt like our guides were just phoning it in; we had a blast on our other cruise excursions but this was a dud. From the looks of it, the ziplining folks were consistently having more fun so if you're debating between the two activities, I suggest avoiding the sea kayaking.
I canoe and my partner has kayaked, yet we still found it incredibly difficult to maneuver against the wind and current. I will be the first to admit we would have benefitted from any instruction, but there was none to be had. We were placed in a kayak, cast off, and left to figure it strokes on our own. I felt bad for a parent and two teenagers in a three-person kayak; they struggled even more and just seemed to have a miserable time.
We were led by two guides who seemed to be having some personal disagreement. It sounded like the lead guide had been working all day and missed lunch (we were an afternoon group) and the other guide thought about grabbing an extra sandwich but didn't. No open disputes but the two didn't speak much to each other. In fact, they didn't speak much at all. We were told an island was called Eagle Island because it had eagles, and spent the rest of the time on the water in silence. My partner and I pointed out starfish and birds to each other just to have some engagement.
One weird aspect was when the rear guide offered to take photos of folks with one of the islands in the backdrop. We said we would really appreciate it, but when we came up with our phone she just paddled away.