Right now much of the world is closed to U.S. tourism. On the whole the Caribbean is opening, and the Maldives opens July 15. Turkey and Serbia are open. But most of the world that will accept Americans at least requires coronavirus testing on arrival or two week quarantine.
The E.U. is trying to come up with a list of countries whose citizens will be allowed to enter starting July 1. The U.S. isn’t expected to be on it.