Located about 3-hour drive from Kathmandu, rafting is another thing to do while you are in Nepal.  You can include this rafting itinerary on the way to Pokhara or Chitwan.  This white water river rafting includes rafting through different rapids, diving, and swimming.  During this 2/3 hour raft, you will get beautiful views of surrounding hills and raft through the exciting rapids.  For the exciting trip, monsoon is better where the river flow and rapid will be in the high level to experience an ultimate thrill.  With all the protective gears like helmet, life jackets, wetsuits, and paddles, you will be at the safe hand during rafting.