For the claustrophobic, I would suggest coming up from the west side of the cache instead of the east side. You'll know why by reading this article.
Off Highway 90, you can actually get within a half of a mile from the cache. Deceptive! Don't pull over on the highway! Do some research first.
The recommended starting point is 47.39279 -121.39311
If you have more problems, I would suggest going to 47.39489 -121.44736 for a hint on how to get to it. Just print out this page and use it only if you have real problems.