http://www.parks.wa.gov/parkpage.asp...20kiln%20point

Here you go...I attached the link for this park on San Juan Island above. And yes, it's a great spot for spotting orcas from the bluffs.
I did this ride from the ferry landing in Friday Harbor a couple of years ago; if I remember correctly it's about a 20 mile round-trip. Also, be aware that, since there's usually lots more traffic on summer weekends than on weekdays, so you should enjoy a lovely, quiet ride on a Monday morning. Even so, I'd always err on making yourselves/your bikes as visible as possible, as many drivers who aren't cyclists have a very hard time spotting cyclists on the road, even when there is a bright sun out there; you can always chance disappearing in the shadows and/or glare, y'know?

Tailwinds!
Mary