A comprehensive 8 day itinerary for Western Bhutan
Day 1 - Flight to Bagdogra (Border Town in Northern part of West Bengal), drive down / catch a prepaid cab from Bagdogra to Pheuntsholing (Drive takes about 5 hours).
Day 2 - Acquire Travel permits in PS for Thimphu and Paro. Leave for Thimpu in a shared / hired cab. Drive time - 5 hours. Very Scenic. Arrive in the evening, walk around Thimphu City, discover the clock tower, enjoy local cuisine / pub scene
Day 3 - Visit Thimphu Choeten Memorial, Buddha Point, Takin Reserve. Enjoy local food and nightlife.
Day 4 - Acquire permit for Punakha. Drive down to Punakha Dzong, visit Dochu la Pass on the way. Either stay in Punakha or get back to Thimphu
Day 8 - Fly out from one of the Highest Altitude airports in the world - Paro International Airport to Bagdogra and catch onward flight.