I lived in Colombia earlier this year. It's super easy to come and go with an American passport. They dropped COVID testing requirements earlier this year. Security there is also super easy- if you saran wrap your bag before checking it, they won't open it. A lot of Colombians saran wrap their bags because security is known to "lose" things of value from bags. There are no health checks, no tracing, nothing...once you're in, it's pretty easy to move around. Also, flights out of MIA are under $200. There are so many places where it's easy to come and go with just a vaccine card and a passport.