Aruba is now accepting proof of vaccination for entry with no other testing required. BUT, (and it's a big BUT), you have to be able to prove you are vaccinated and those white cards will not work. Right now they are only accepting the SMART health card, which only residents of California and Louisiana or people who got the vaccine at Walmart or Sam's Club can get. They say that are exploring other options as well. I can certainly see St. Martin and others accepting vaccination status, but those cards are easily forged, so they are not likely to accept them and there's so much stupid resistance in the US to any kind of digital proof of vaccination status that it may be that we are stuck with testing for a while. The US had a year to prepare and could have easily assigned non-forgeable QR codes like St. Martin is doing, but didn't.