Bahrain, seriously, who comes up with this s__t? Now, I admit, it's been a few years since I was there but even then it was less than something I would wish on anyone.
The UAE, worked in Dubai for three years, Yes, it had it's ammenities, but the fact that it's a Muslim kingdom is hard to get past. You either do as the sheik says or your gone and God help the working people from Pakistan and India living in cardboard boxes and working non-stop for six months to one year.
Singapore, worked and lived there for many years between 1973 and 2006. Great place to work but to consider living there in retirement is a bit of a stretch. Yes, it has good food, bars and shopping but at the end of the day it's an expensive urban jungle!
Not three places at the top of my list!