Hello! That sounds like a wonderful trip. Here are some travel tips for your visit to Paro, Thimphu, and Punakha in Bhutan.

Best Time to Visit:
The best time to visit these locations in Bhutan is during the spring months of March to May and the fall months of September to November. During these seasons, the weather is pleasant, and you can see the clear views of the Himalayas.

Route and Accessibility:
You can start your Bhutan tour from Paro, as it houses the only international airport in the country. From Paro, you can reach Thimphu by road in about 1-1.5 hours. Similarly, it takes about 2-3 hours by road to reach Punakha from Thimphu.

Accommodation and Booking:
There is a wide range of hotels in all three locations, from budget guesthouses to luxury resorts. Booking in advance is advisable, especially during the peak seasons. Use reliable travel sites for bookings, and ensure they have all the necessary amenities.

Clothing and Essentials:
Pack clothing suitable for a cool, mountain climate. Layered clothing is a good idea as temperatures will fluctuate throughout the day. Essentials would include items like sunglasses, sunscreen, hats, comfortable walking shoes, and a reusable water bottle. Also, remember to carry your passport and other necessary travel documents.

Health and Safety:
Ensure you have travel insurance and that you're up to date on routine vaccines before every trip. It's also a good idea to carry basic medical supplies, like band-aids, antiseptic wipes, and medication for common ailments. Be aware of your surroundings and avoid travel at night, especially on the mountain roads which can be dangerous.

Local Etiquette and Respect:
Bhutan is deeply rooted in its Buddhist traditions. Respect local traditions and customs. Dress modestly, especially in religious places, and always ask before taking photographs of people or religious sites.