Sign me up, for sure. I was actually just researching Superclass regulations and discs yesterday, good timing!
As to the venue, North Park would be well suited to it, except that I believe part of the agreement when it was installed was that there were to be no "organized events" there. Plus, it'd be tough to have a regulated tourney there with all the action it gets on the weekends. Terrace would be a possibility, some of the holes would be true par 4's and maybe even 5's. Lakewood in all the short positions could be fun too, though again, might be tough to have a tourney there on the weekend if there's a good turnout (you
can reserve the course, but it costs ~$300

).
I really enjoyed the Ice Bowl, and think doing something similar would be the best route. Kyle made some good points in regards to introducing new non-DGers to the scene. Discovery and Woodland are both good bets. I haven't been to Volunteer Park, but we were talking about great parks in Seattle on the way to the Port Angeles tourney and Mark said that he always thought about holes there while walking around. I haven't been to Interlaken or Ravenna, so can't say for those either. I'd like to put Hamlin in Shoreline into the mix. It's a sweet piece of land with lots of trees and elevation, and I know it has Ultimate being played on a regular basis in the fields, so that could draw in a bunch of participants right there.
Hmm...just thinking out loud here...with all the sweet parks in the Seattle metro area, how cool would it be to have a Superclass series that tours the different parks? I guess we should see how a standalone goes before doing anything in that respect, but I for one, think that would be great for the scene and tons of fun.