I just got back from Mandalay but I went principally to take a cruise on the Ayeyarwady river. The country is struggling to deal with the incredible increase in tourists which has occurred since 2011 so hotels etc. are not cheap anymore and many of the best are fully booked.
My port of entry was Yangon and I stayed at the Savoy hotel. It's beautiful and is a converted colonial house - lots of teak. Very good service. We had just a day to see Yangon - principally the Schwedagon Temple (Sp?), the People's Park, the central market, another temple with a large reclining Buddha and a drive by of some other sights. We then flew to Mandalay - saw the teak bridge, the Royal Palace grounds and a temple on high ground across the river.
We went to Bagan - very beautiful, but kind of overrun with tourists - many of the sites are not well managed by anyone so there could be crowds of people at the same time for sunset watching or whatever. Also lots of places to stay in the new Bagan - I loved the pagodas, but not the touristy atmosphere. Lots of people loved the balloon rides at sunrise over the temples - I think this is quite expensive, but many thought it was a once in a lifetime sight.
Went to Mt Popa - did not climb up the 717 steps to the pagoda - didn't want to deal with the monkeys. But it's a temple many of the Burmese go to visit as it is sacred and home to the "nats" (Spirits). This was a day trip from the ship and we saw a lot more of how the average person lives in Myanmar on this trip.
Also went to Monywa - again more interesting as a slice of more local life. And we docked at a smaller town called Myin Mu - quite a nice little town - good local market.
We saw a lot of pagodas - unlike other places, you must remove both your shoes AND your socks. Bare feet only in the temple areas.
There was a lot of interesting food - lots of rice of course and some very good salads - tea leaf salad was unusual and very good. I only ate on the ship or restaurant type places - I did not eat any street food.
I would go back to Myanmar - the changes in the country are evident and the contrast between the cities and the villages is quite striking. The people were very nice although in some places the souvenir sellers can be very persistent and follow you around.
Electricity is not reliable in many places, even Yangon. Don't even think about drinking anything but bottled water.