I'd be interested in how you came to Panama as the choice. I've looked into this and Portugal came out as the top choice. More dreaming than anything else - as soon as grandkids are in play my wife won't go anywhere and that probably isn't too far away.
Things we like about Panama:
Just a 3 Hour flight from Miami.
Ease of getting a retirement visa, and nice perks
Close to the equator, so no changing seasons and daylight hours stay the same all year.
Variety of microclimates. In our areas of interest, temps rarely drop below the mid 70s or higher than the low 90s. It's always summer. If we find it too hot, we can move to a bit higher elevation.
Some of the best fishing in the world - Tuna, Marlin, Mahi Mahi, Roosterfish....yes please!
The variety of amazing wildlife, especially birds. Seeing Toucans and Parrots in the wild is pretty cool. Sloths too. The entire country is a tropical jungle with tons of interesting things to see and be afraid of. Lol
Because of how vital the Panama Canal is to the US (and global trade), the US has a vested interest in keeping an eye on and assisting Panama as it's primary partner in the region. Being buddies with and being so close to the US is a big plus.
No exchange rate or switching money, as US currency is accepted everywhere (the Panamanian Balboa is 1:1 with USD)
Panama has changed a lot in the last 10 years and standards are constantly rising and improving in several in everything from health care, restaurants, roads, internet service, etc. By the time we retire in 10 years, the progress should be pretty dramatic.
Perhaps most importantly, we prefer to learn Spanish over Portuguese, and we don't really want to move to or live in Europe. Central America is way easier to relocate to.