Float it Down the River is an exciting design activity that involves students in a hands-on, creative project in which they use higher order thinking skills in a motivating setting. Students working in groups of four to six are challenged to design and build a floating craft by following a specific set of guidelines. As they design their craft and carry out the activity, they (1) practice inquiry science, (2) discover a number of scientific principles, (3) apply mathematics, and (4) discover the relationship between mathematics and science.