Songs that go with a theme of yachts?

In physics we re doing a project where we have to build a boat and pick a theme and we picked yachts. We also need to pick a song. We can t use "I m on a boat" and it needs to be appropriate for preschoolers parents as preschoolers and parents will be watching when we put our boats in the pool. They are big enough for someone to fit in and they have to paddle across the pool. I also need to know what I should wear for the theme along with the song.