This is the place to post questions and discussions on usage and style. The members of the Wordwizard Clubhouse will also often be able to help you to formulate that difficult letter.
Ducks. We went on the original in Wisconsin Dells years ago - fun! In general they are amphibious vehicles.
Also available in Boston (Massachusetts).
The origin of the term 'duck' for this kind of vehicle is described here
BonnieL and Erik : Thank you two so so much.