The river Cam is a major attraction of Cambridge. Tours of about a mile-long stretch of the river by Punts(small boats) are available on payment. The 45- minute tours offer magnificent backside views of the world famous colleges on one side and natural beauty in abundance on the other. The boats are such that one can almost lie down and look all around. A large number of tourists can be seen flocking to the river all the time for punting. Visit to Cambridge is incomplete without punting.