There are various approaches to this cache, but the most common route starts at the Mount Margaret trailhead (see WP). Take exit 54 from I-90, then unpaved forest roads 4832 and 4934 to trailhead parking (your GPS should route you correctly). The roads are generally in good shape; however, in July 2018 the final section to parking had enormous potholes and dips that might defeat a low-slung sedan or fifth-wheel. You do not need a pass to park at the trailhead; it's free.
From there, the hike is 2 miles one way with 1,600 feet of elevation gain. Follow the Mount Margaret Trail until you are about 300 feet from the cache. The cache isn't on the trail, so you have two options: bushwhack to the cache location through the brush, or (easier route) follow the trail past the cache location to the ridge, take in the views, then follow the ridgeline / track until you see the waytrail down the the cache, which is just below the ridge.
This is a moderate mountain hike, so hiking shoes, water, and other backcountry essentials are recommended. Don't forget your camera - weather permitting, you'll have nice views of Mount Rainier and the Snoqualmie Pass area. If you go the few feet from the cache to the ridge top, you'll have truly spectacular views.
This area of the Cascades can have snow well into the summer (often into July), so plan your trip accordingly. Your chances of reaching and finding the cache in deep snow are almost nil, and simply visiting the location without the signing the cache log does not qualify as a find. You may want to check Snoqualmie Pass weather and I-90 road conditions to prepare for your trip.
The cache: The container is a 30cal ammo can. Thanks to WatchDOGSMike for customizing the can for me.
Pro tip: Go in August or early September if you want to snack on ripe huckleberries en route to the cache. The trailside is loaded with bushes, and we've come back with our faces and hands stained purple. Yum!
Origins: The original cache, placed in June 2000 by ajroman and his girlfriend Karen, was famously a recipe box found at a yard sale for 10 cents.
While you're here, you really should get Mount Margaret and Livin' on the Edge. Both offer breath-taking viewpoints over the area (but are not recommended for acrophobes).
If you use a Garmin or DeLorme GPSr, Northwest Trails could prove helpful.
In Memorium: Eric McDonald (ECM41)
On Aug. 17, 2014, geocacher Eric McDonald (ECM41) was hiking to this cache before the Going APE mega-event, along with his 12yo daughter and best friend Hoovers69, when he had a heart attack. Despite more than an hour of CPR, Eric died on the trail before paramedics could reach him. Our condolences to his wife Carol and daughter KayLynn, his family, and his many friends. A Puyallup resident, Eric was only 43 and in good shape, and was at the Block Party the day before, so this was a huge shock. He will be greatly missed in the Puget Sound caching community.
Page views added Oct. 4, 2012. This cache was placed in June 2000, so this counter doesn't begin to capture all the visitors to this page, but it's still fun to see: