This doesn’t really bring up visions of Joshua Slocum or bashing ‘round the Horn, but it could add a bit of spice to your local raft-up next summer. It’s the Aqua Beach Wave Floating Party Mat, and it could bring some fun after you tie up in the calm waters of a quiet cove. The Floating Party Mat is different. It’s made with soft, durable cross-link foam so it won’t tear, and it has four cup holders (need we say more). It has mooring lines and hook-and-loop straps to keep you floating in one spot, and it has Velcro straps…