The downstairs isn't as bad noise wise as you'll expect it to be. While your thinking paddle boat, the paddle is really only there for decoration now I believe. It spins, but really does no propelling The boat itself is driven by regular motors. Vibration, well, ya, there's some, not as bad as when it was an actual paddle boat, but it's still there. Maybe look into a decent set of shock mounts, and possibly roll off the bass to help with the motor drone a bit. Other than that, it is what it is.
It's pretty sall with low ceilings, expect lots of crowd noise and try to say away from the bar, it's kinda tough with the room being like 20 x 30 :-p
If some pics would help you, I believe I have a few I could send you of the room.
Maybe we'll stop over for that one. The cruises are always a good time.