To add to all above points,
1. If you have been rude in front of a religious ground or monk, say "gadaw" twice as a sign of respect.
2. When addressing someone, make sure to put appropriate Burmese honorifics. Eg. U for Mr., Daw for Mrs.
3. Offer a seat to an elderly or a woman when all other places are occupied.
4. When eating, serve the eldest member of the group first.
5. Before starting a discussion about something shameful, request for permission first.
6. For hygiene reasons, dine only at a clean restaurant on your travels to countryside.
7. Purchase gems and arts from legal authorized dealers and don't forget to get a receipt.
8. Carry some medicine on your trip around the country. Clinics are very few in villages.
9. Oh and one more thing. Toilet papers in your bags!!! Very important especially on train or bus journey.
1. Drink Tap Water!!! (Very important - diarrhea from self-experience)
2. Extend your legs towards or cross over elder people. Touching their heads, is of course, also considered as an insolent act.
3. Offer handshakes with a monk.
Burmese people are English literate and so, you can always make use of the lingua franca to ask for directions or contact doctors if you have medical emergencies.