Most 20' x 6' rooms that sit above the water are expensive — after, real estate is all about location. Now you can have that same space on a platform above the water for less than you might think. The Watermat ($600) is a 20' x 6' mat made of closed-cell foam that weighs only 50 pounds and yet can hold up to 1500 pounds on the water. The mat is also double-sided for traction on the one side and sliding fun on the other.

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