Prudence suggests that you don't take your most expensive gear and definitely avoid photographing anything 'official' which I would include things like airports, police stations, train stations, civic buildings etc. There are so many scare stories from even relatively sophisticated countries of problems of photography of any type of government, military or civic locations. Only recently a load of british air enthusiasts were jailed for taking photos of planes at the airport in Greece - I'm certain that Burma is much more paranoid, particularly following the recent Tsunami which they've effectively put a news black out on.
Take care.