What would you do about light rail?

I recently moved back to Seattle and after 6 years away I'm surprised and encouraged that some progress actually appears to be happening. I'm fairly disappointed in the extremely limited route for the first leg: downtown (or maybe the UW) to the airport. Seriously? That's it? Even the roads and transit measure is fairly disappointing in how limited it is.

So, what would you do to improve the system? I've got plenty of ideas I'll post shortly, but here's some maps I made using wikimapia and MS paint. The red line is the currently under construction line, the orange, seafoam, and blue lines are the north, south, and east links that are part of the roads and transit measure.