Picking the Plums. Imlay is one of the best canyons in Zion, if not THE best. The first descent required three days and was a feat of amazing bravery and chutzpah. With knowledge of the route, plus modern techniques and equipment, it is now a wonderful journey inside the stone, with pothole challenges that add spice.
The Sneak Route enters the canyon near the halfway point, gaining the very best canyon sections with minimal effort (though the Sneak Route itself is rather rugged). It is sometimes used as a day-and-a-half route, bivying at the alcove before getting wet, or it is done by skilled parties in a reasonable day, with an early start.
From the main canyon, follow the West Rim Trail about half way to the rim, then go cross-country route over two passes and into the Imlay drainage. Follow Imlay through its two fabulous narrows to The Narrows, then hike out to the Temple of Sinawava. Getting a "White Pass" allows parking at The Grotto before the buses run in the morning.
First descent: June 7–9, 1978 by Mike Bogart, Mary Dern, & Dennis Turville.