Bring as much as film rolls as you might need. Bhutan is a photographer’s paradise…everything seems exotic and unique that would would end up taking more shots than you would usually do in other places. Thimphu, Phuentsholing and Bumthang has colour photo printing shops. But the quality is not up to the professional standard.
You would do better to bring along special equipments and batteries for you digital camera. UV filter for your telephoto lens camera is recommended to cut down on UV light in thin air.