If you only travel to the Southwest once, this is the loop almost everyone drives, and for good reason. From Las Vegas it runs in a wide arc through the most famous parks and back again. Each stop is a highlight on its own, together they are unforgettable.
Why start in Las Vegas
Vegas has the cheapest airport in the region and often the cheapest rental cars, an ideal start and finish. One night to arrive is enough.
The right pace
Don't plan too tightly. Better one stop fewer and time to take it in. The drives between the parks are an experience in themselves, with constantly changing landscapes.
When to go
Spring and autumn are ideal. In high summer the lower areas get very hot, in winter the higher parks are partly under snow and some roads are closed.