Seattle trip suggestions

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Hi - my wife and I are going to be in Seattle on a business trip in late April 2008 and we are thinking about adding a 4-6 day cycling trip to our stay. We could use your help and advice:

What are some good routes in the area or nearby?

Are there any tour companies in the area that do guided tour or self supported tours? I know this may not be a time of the year that tour companies would be running trips.

We have been considering buying touring bikes (preferably with S&S couplers for travel) for sometime. There seem to be number of builders and shops in the area. Any recommendations would be appreciated.

Thanks for all your help!