LAS is in a valley so wide that the mountains are hardly a factor.
Los Angeles on the other hand . . .
is fortunate to have a fairly flat valley out toward Ontario that is pretty much aligned with their four main runways. Otherwise you don't see the city until just a few minutes out. From the North it is a bit of a slam-dunk.
is right up against the high mountains - they rise eight thousand feet above the airport in just a few miles and a thousand feet in much less distance.
is aligned with the east-west valley and the approach/departure corridors sort of underlie those for LAX
from the north/east is an extremely steep approach but not all of that is dictated by terrain (which includes Saddleback Mountain)
Most of the airports in the intermountain west are affected by the mountains around them.
Happiness is not seeing another trite Ste. Maarten photo all week long.