Go in October-November or between March and May to go on a trek between Paro and Thimphu, for example. The Jhomolhari trek is also exceptional, offering breathtaking scenery. Even though it is (very) expensive, the Snowman trek remains a must for the more fond of sports with a taste for adventure.
Go and meet Bhutan's mountain goats and also come across red pandas. Choose Royal Manas National Park to meet the country's wild species, but be careful: tourism here is in its infancy. Or walk amongst the rhododendrons and be hypnotised by the beauty of the absolutely sublime Dochula forest. Favour spring and autumn.
You cannot go to Bhutan without taking part in a tsechu, a typical dance festival . You will be charmed by the masked dances and magnificent costumes of these celebrations. Take part in Ura yakchoe or Punakha Drubchen in February or March. If you go in June despite the monsoon, you will be able to take part in the Kurjey festival. If you do not mind the crowd, take part in Paro's tsechu in November-December.
Why not treat yourself with a luxury trip and get pampered? A trip to Bhutan affords a good opportunity to do so. Receive a massage, take yoga classes, hot stone baths... and discover the well-renowned Ayurvedic care. Favour autumn and spring.
Bhutan abounds in fabulous pilgrimage sites. The most well-known is Taktshang Goemba, but you can also discover Gom Kora and its numerous relics. To discover these out of the ordinary sacred places in the best possible climatic conditions, avoiding the rain and mud, go preferably in spring or autumn.