I just finished watching "Viva Las Vegas" (1964) for the first time ever. I know--I'm slightly behind the times.
There's not much point in a full review. After all, you've either already seen it or can make a darn good guess about what you'll get if you sit down to watch it: dumb plot that is just an excuse for Elvis and Ann-Margaret to sing, dance, and flirt.
What I enjoyed most was how it captured Old Vegas: for example, the car race downtown, zooming east on Fremont Street, then turning south on Casino Center, as you can see in the shots above. (Notice that when the race finally ends, a finish line has mysteriously appeared on the street at the intersection of Fremont and Casino Center where there was none before!) It would be rather difficult to do that today....
There are also nice shots of the race going over Hoover Dam, though the desert, and to a forested area that I have to assume is probably in the vicinity of Mt. Charleston. And, of course, strewn throughout the film are many shots of downtown, the Strip, and casino interiors. (Elvis has to visit every show in town in one night to locate his dream girl, whose name and working location he failed to get upon meeting her.) There's also a small part with actor William Demarest, whom I knew growing up only as Uncle Charlie on "My Three Sons."
I don't know how you could not like this stuff. Then again, I'm kind of a sucker for cheese.