I found four boats on this map: The row boat, the sail "raft", the speed boat, and the freighter. Prior to boarding the freighter, take the row boat or raft to the speed boat within viewing distance. Use the two round pylons to wheel the speed boat into the water. From there, ride around the water for a couple minutes until the achievement pops up.
This can also be done with any of the first two boats, but the speed boat travels much faster and can cover the 1km in much less time.