Sanjuan Island is famous for whalte watching. But there are hundredes of activities you can do on these islands. Get a ferry to Island. Then you need another 4 hour boat ride for whale watching. If you are lucky you will be able to see Whale. If not you will see Orcas, dolphin. It is going to be a fun ride.
Best Places to Visit in Washington
If you are visiting Washington - a tour to Bainbridge island is worth the time. Ferry ride from Seattle to Bainbridge is very beautiful. You can see Seattle water front, beautiful scenary and view of beach from ferry. Once you reach Bainbridge - a walking tour of downtowm, quick cycle tour is enough for having a good time. In evening you can take ferry back to Seattle.