River Tubing is an outdoor sport in which people ride innertubes or inflated disks down a river. The tubes themselves are also known as “donuts” or “biscuits” due to their shape. Depending on the conditions at the river, tubing can be a relaxing way to spend an afternoon, or it can be an invigorating adventure. On a gentle river, this sport is suitable for people of a wide range of ages and physical abilities, and it can be a great vacation activity for people travelling with children.