As mentioned, we went out like tourists on the second day of our trip to Seattle. This was all, basically, planned, so there was no horrible disappointments with this at all.
We weren't really sure what we wanted to do, but decided that all the cool stuff we haven't seen was near the Space needle, so that's where we went!
Before leaving Seattle, we went up this one HUGE tower, that had one of those rooftop things with a view. When i remember the name, I'll add it, but, until then, you can just enjoy the same view that I did.