If you are not so good at biking, take a biking tour and enjoy a relaxed ride in the countryside of Bhutan. But if you are really good, take your chances at the annual Dragon Race.
Biking in the Himalayas isn't an easy task, meanwhile participating in the Tour of the Dragon (268 km) or the Dragon Fury Race (60 km) is a real challenge. Both of the competitions include steep lifts up the hills and crazy downhills. The Tour of the Dragon starts in Jakar (Bumthang Valley) and the Dragon Fury Race begins in Messina, both of them end in the capital of Thimphu. Everyone can participate in each tour, but registration and a fee are required. Moreover, there are special awards for the youngest and the oldest participants, who complete the whole race.
These competitions are held in the first days of September, and even if you don't receive an award, it will be a memorable experience.