A kayak is a small, narrow watercraft which is propelled by means of a double-bladed paddle. the word kayak originates from the greenlandic language, where it is the. Kayaking is the use of a kayak for moving across water. it is distinguished from canoeing by the sitting position of the paddler and the number of blades on the paddle.. Proven boat designs, and how-to information for boat building. boat plans are for beginners and have been built by thousands since 1953..