There's place called Cerro Azul (trad. 'blue hill') about a couple hours east of Panama City and the canal, but I live at the west end of Panama near the border with Costa Rica where the big mountains are.
Yes that is the place. I had a customer in Panama and he introduced me to that area back in the mid 80's. He thought I ought to retire there. According to him I would not have to pay any taxes and lots of other benefits. Beautiful area. Very tempting, but I'm afraid it's too late now.