The Champs-Élysées was a famous avenue of Paris, France on Earth's European continent.
In 2368, while on a date with a fellow USS Enterprise-D crewman, Nurse Alyssa Ogawa walked with him, after dinner, in a recreation of the Champs Elysees on the ship's holodeck. (TNG: "Imaginary Friend")
The simulation was also available aboard the USS Enterprise-E in 2373. (Star Trek: First Contact)
Champs-Élysées was described as a "street in the old city, known for its beautiful gardens" in the Star Trek Encyclopedia, 4th ed., vol. 1, p. 132.