Hello! It's great to hear that you're planning a trip to Paro, Thimphu, Punakha, and Trongsa. Here are some travel tips to consider.

Best Time to Visit:
The best time to visit these cities in Bhutan is during the Spring (March to May) and Autumn (September to November). These periods offer moderate temperatures and the most spectacular festivals.

Route and Accessibility:
Paro International Airport is the only international airport in Bhutan. From there, numerous taxis and buses can take you to Thimphu, Punakha and Trongsa. Traveling within Bhutan can be time-consuming due to winding roads and mountainous terrain, so plan accordingly.

Accommodation and Booking:
There are various types of accommodation available in all these cities ranging from luxury hotels to modest hostels. It's mandatory to book through a licensed Bhutanese tour operator or their international partners

Clothing and Essentials:
Pack warm layers for the colder temperatures in the evening. Comfortable walking shoes are a must as there are many beautiful hikes and walks. Don't forget your rain gear, especially if you're going during the monsoon season (June - August).

Health and Safety:
Ensure you are up-to-date with routine vaccines before every trip. No specific health precautions are necessary, but health facilities are basic so it's recommended to bring along any necessary medication.

Local Etiquette and Respect:
Bhutanese people are warm and traditional. Ensure to dress modestly, especially when visiting religious sites. Always ask for permission before photographing local people.