Reggae pours out of the speakers and sends its crisp, warm sound over pool 7 at the harbor in Aarhus. Once in a while, porpoises and seals peek out from the surface, and as the pack of excited wakeboarders approach the raft where the ride begins, a seal lazily jumps into the water. No more sunbathing now, because it's time to start the cable car so the water dogs can speed up the board and fly over the waves.