There is something important to remember. Your Amex will pay for damages to YOUR car and not any damage you cause to others. It is vital to purchase liability coverage. Without it you have the chance of sitting in jail while the issue is sorted out.
I suggest purchasing an at home test and travel with it before arriving. You need the ability for Facetime and 15 minutes. I have used it several times with no problem. It's important to remember this test is not accepted in all countries. Colombia does not accept these results.
I had numerous blood tests following my Covid-19. After 7 or 8 months there was only a trace of antibodies. I think each person reacts differently, but the vaccine is needed ( if you want it).
International passengers and operators of private or commercial vehicles that are transferring them, as well as duly identified employees of the maritime and air transport sector, in transit or from ports and airports.