It's about 2.5 hours from Seattle to Mt. Saint Helen's traveling down I-5. The sun was out and there was little cloud cover. As a result I could see my destination pretty much the whole way down.
I was super impressed with the GS. Loads of power even in 6 gear and the handling was fantastic! My two complaints are the seat and the location of the handle bars. After about an hour my butt started to fall asleep and I would have liked to have some risers on the bars. The angle was a little awkward but not bad.
This bridge was at the end of the blast radius. Some 14.8 miles from the center of the crater!
There were tons of great view points along the way and it was hard not to stop at them all...but hell I had all day.