http://www.nationalgeographic.com/adventure/0306/swimming.html
Aztec Falls
If Aztec Falls were a ski area, it would be Squaw Valley—steep and deep. The cataract is on Deep Creek in San Bernardino National Forest, and this swimming hole has amazing vertical: The sissy ledge is 30 feet high; the big one tops out at near 60. Surrounded by smooth rock and rich green conifers.
Height: 5; depth: 5; privacy: 3.
Bonus: Good side trip off the Pacific Crest Trail.
Location: About 30 miles northeast of San Bernardino. From San Bernardino, take State Road 18 north and then east for 18 miles to Crest Park. Drive 3.1 miles north on State Road 173 through Lake Arrowhead to Hook Creek Road. Travel 3 miles east on Hook Creek, then bear left a short distance on Squint Ranch Road to a right-hand descent that leads .45 miles to Splinter's Cabin and access to the Pacific Crest Trail. Hike .4 miles north (downstream) on the PCT to Aztec.
Difficulty: Intermediate
A short walk on the Pacific Coast Trail.