The US travel ban says:
foreign nationals who have been in any of the following countries during the past 14 days may not enter the United States.
and then goes on to list Schengen, UK, Brazil, China, Brazil, Iran.
However, the Caribbean is opening back up to both US and UK tourists starting 1 July, including Puerto Rico.
Could I not just go to the Caribbean for 14 days, chill on the beach, and then enter the US? I had a big US road trip planned this summer and don't want to give up on it!
Yes, you can!
The document issues by the Whitehouse explaining the ban states:
The entry into the United States, as immigrants or nonimmigrants, of all aliens who were physically present within the United Kingdom, excluding overseas territories outside of Europe, or the Republic of Ireland during the 14-day period preceding their entry or attempted entry into the United States is hereby suspended and limited subject to section 2 of this proclamation.
You haven't been to the UK in the past 14 days before your attempted entry so that's fine.