Although things can get busy, November through February is the best time to visit Myanmar. During this period, the beaches are irresistible, the water activities most enjoyable, the sunrises and sunsets are unforgettable. At this time, you have an excellent chance to explore the Hlawga National Park or mud volcanoes of Minbu.
The spring is quite hot, but you will have a chance to witness Novitiation Ceremony and Padauk blossom. Note that roads in Myanmar become impassable during the monsoon season from May to October.