Sungai Selangor Water Rafting. This river is the second best river in malaysia.you will plunge into the hydraulic,first canon,se cond cannon,last rapid and many . It's a beautiful river forest with cool, clear water. Whitewater rafting on the sungai selangor is by far the most popular adventure activity one can do in . Sungai slim is surrounded by jungle and plantation is peppered with fun class 2.