Also speak that american accent with most strangers since they have usually learnt american english and will probably understand me better.
I love it when I meet Asians who learned English from the English. Same goes for black people from England. The accents are so unexpected that they sound really appealing and cool.
I have a good friend who lives and works in West Hollywood. Whenever he comes to visit his accent sounds hella gay when he first shows up, and gets less and less gay as the visit progresses. We definitely adjust our speech based on whom we are surrounded by. I once hung out with a Londoner for a week, and near the end of the trip it was pointed out to me that I was speaking with an English accent when I got drunk. The funny thing is that my then-girlfriend told me to stop it, and I couldn’t. I couldn’t go back to my normal accent for some reason. Of course it went back to normal on its own when I sobered up the next day.