I love webcam caches, and since they are no longer allowed over on another site, I thought I would add this one. The difficulty rating is only due to the fact that you might need to enlist the help of someone else back at a computer to save the photo evidence of your visit. That helper ( or you on a web-enabled device ) needs to capture an image of you at the above coordinates, as seen from the webcam here: http://www.tacoma.uw.edu/node/20204
Here's a sample:
Note the latest in virtual reality, as we have spared no expense in simulating an actual cacher at the location. =)