Stop in the middle of the road~
And take a picture of yourself with the Arc de Triomphe!
It is perfectly legal, just stop in the middle of the zebra cross. It's a bit scary though, when some cars dashing through your sides.
Oh, and some boutiques around Champs-Elysees are closed on Sundays, particularly the more expensive and luxurious brands like Chanel, Gucci and Dior.