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Cycling is still in development. Interesting may be downhill mountain biking from Jomsomu to Pokhara.
Rafting is a favorite adrenalin activity in Nepal. Every travel agency in Kathmandu will arrange you a trip for quite a wild river Trishuli. Ideal when combined with a trip to see animals in Chitwan.
Paragliding is of increasing popularity in Pokhara from Sarangkot hill.
There are possibilities of extreme bungee jumping. For example 160 meters high bungee jump into the ravine Bhote Kosi.