From HWY 66 take Indian Res. road # 18 thru the Hualapai Indian Res. to the Havasupai Indian Res. Follow Road # 18 to the end. There you will find a parking lot and the trailhead. It's a 8 mile hike to the village of Supai and another 2 miles to the falls, creek and campground. You can also helicopter in and out, cost is $85 one way. A five minute trip.
Here is what Havasu looks like the day after very heavy rains. The water turns a beautiful chocolate brown. I think the terraces and pools are much more photogenic than the falls themselves. Well worth the effort to get to this location! RB