buy property in Panama, transfer your monthly payouts there, get pensionado visa, import tax free household goods, car (tax free once every two years), buy into local medical coverage (excellent hospitals, on par, if not better than the US facillities, US trained docs), US currency (no exchange), most folks are fluent in english, major international port and air hub (under $300 round trip to US), super cheap living on the oceanside, rare hurricanes (they pass further up north), a lot of tax-free perks, the roads are built by US Corps of Engineers......
do not go to costa rica (too expensive), or nicaragua or belize (too poor, even though cost of living is low).
or, Philippines, as another alternative to panama...