re: What all should I do while in Seattle?

I've been up there several times. The first time I went I took one of the city tours the first day I got there. They take you all over to see different sites and you get to get a feel for the neighborhoods and such.

Go to the Ballard locks and see the salmon go up the "steps". It's also cool to watch the boats get let through the locks with water having to be raised and lowered. Especially neat if UW has a home game and all of the nice boats are coming and going.

Take the ferry over to Bainbridge to see the city from the sound.

Pay to hope on a sailboat to take a tour of the sound if the weather is nice. Great view of the city and mountain ranges from out there.

Hit up breweries or go to one of the neigbhood areas and bar hop. Ballard is pretty damn cool.
Check into a farmers market in one of these areas.

Drive out to one of the mountains in the area and hike a little.