If you can arrange healthcare coverage both Latin America and Europe are also excellent choices for full-time or part-time residence. Condo apartments are very cheap in much of Europe and traditionally their fine free healthcare covered all there. I've heard that's not true in many countries now though and Medicare does not cover you outside the US, so it's a factor sometimes now.
My "dream" retirement, which I did not do, was living 6 months in Montreal and 6 months in Fort Lauderdale's gay Wilton Manors.