Everyone needs visa for Bhutan except the people of India, Bangladesh and Maldives in order to travel to Bhutan.
At the port, Bangladesh and Maldives citizens can get permit on producing passports
While Indian national may also use their Voters Identity Card if they do not have passport.
Although the Bhutan visa process is quite different but it is simple and straightforward. Do not have to send your original passport away. Can send a scan copy of photo-page of your passport.
For this case, we can easily apply the visa. Once you get the Visa,  the Visa Clearance Letter will be emailed to you based on which the actual Bhutan visa will be stamped on your passport on arrival in Bhutan.
Bhutan Visa Fee: US$ 40 per person