Actually Grand Canyon National Park is just east of Las Vegas. It is about 200 miles east of Vegas. It is somewhat out of the way but I believe if you take I80 W and then take US 191 south you would run into the Grand Canyon National Park. Then it is only another 300 miles to Las Vegas. If you do that it adds about 5 hours onto the trip than driving straight to Vegas.Well, which is about what most consider half a day's drive, without adding in the time spent at the Grand Canyon itself. It was a fair point, I thought. Anyway, while we're on the subject (sort of), Red Rocks, just outside LV, is a fantastic diversion for those on a too-long weekend there who are sick of spending money, getting drunk, or the casino atmosphere.