Potential trip to Seattle next summer recommendations needed.

So my buddy decided that he wants to get married in seattle next summer... i plan on doing one day of riding. since time of year might play into where i can ride the wedding is scheduled for Mid june. Has anyone ridden out there and could give me a few trails to hit? I am also looking for a suggestion as to what level my fitness should be for a decent ride. I know its a lot of long climbs out there. I also will not be bringing my bike so i hope there are rental options somewhere. Thanks in advance.