Hang a 250-horsepower outboard on any pontoon with a strong enough transom and the flotation to carry the added weight, and yeah, it will get up and go. But thanks to a redesign of Crestliner's entire line of 2008 pontoons, the Grand Cayman makes the most of all that oomph. They started by reducing some of the plowing characteristics common with pontoon tubes. This is done with concave lifting strakes, which helped allow lots of air under the tubes during our tests with four adults on board. Our top speed of 50 mph was among the best we've tested among pontoons rigged with single outboards.