I might be honest and say that I enjoy this place slightly more than the strip.
Located in Old Vegas, the Fremont St. Experience is quite an amazing place. Usually full of homeless, artists, gamblers and performers alike, you will get it all at this little humble strip of Vegas.
The overhead arch is actually a lightboard which plays different advertisements as well as some cute/corny shows such as an alien attack. There are amazing artists creating paintings on this street, and sell them super cheap (check out the dudes who make spray paint art - WOW!). There are also an abundance of performers: some dude who puts himself in a box, stages that have dancers and singers, and much much more.
This is also home to some of the original casinos such as Golden Nugget, Freemont, etc.
Check it out!