Wayne Rooney is taking in some last minute R&R before signing with D.C. United ... chillin' on a yacht in Barbados with his wife and kids ... without a care in the world.
The 32-year-old is thiiiis close to inking his deal to become the latest European superstar to jump to MLS in the U.S. ... even though some critics think he's washed up.
The skeptics ain't bothering Rooney though ... who was busy floating away on an inflatable raft on Monday.
As we previously reported, Rooney flew into D.