Walt asked me for my opinion on this, so here goes:
The house is blurred some, as is the shoreline, but not as much as the boat. This is because the shot was taken with a wide angle lens. There is a lot of perspective with wide angle lenses, which means it would take a while for subjects in the background to "travel through" the frame, if that makes any sense.
This isn't shot from a tripod. It's either shot with a gyro/steady-cam device or just plain old handheld from another boat that is chasing the Ski Nautique at speed. If the camera is traveling at the same speed as the subject, then the subject won't be blurry (which is why the models have to hold still in shots like this --- you can see the young girl's hair is blurry because it's blowing in the wind).
My best guess is somewhere around ISO 100, 1/80th @ f13. I'm judging this based on similar pictures I've taken, and the fact that some of the spray from the boat is still kind of visible (it's not all one white blur). This photo I took is 1/40th @ f9 on ISO 400 (it was cloudy out), but it gives you a sense of the blur you achieve at 1/40th. Although, a lot of that depends on the speed the boats are traveling, as well. I know we were cruising at a pretty good pace for the photo of the Malibu, but I have no idea what that Nautique is going at. That just means there's a whole lot more room for guessing camera settings...