You'll love the kayak tour. When we did it, they gave us "aprons" that we wore and that fit around the opening of the kayak, to keep water out. Nothing got wet, anyway, except the paddle blades and the bottom of the kayak.
It's very calm, quiet and peaceful. It's not very physically taxing, and when you get tired of paddling, you just stop and sit for a while until you want to paddle again. The group is always in sight and there's time to paddle around on your own. We didn't see any whales that close to shore.