There are some fine, big loops North, South and East of Seattle. Post here is you want something bigger to ride. If you really want something different and have access to a car that can carry your bike, drive up to Anacortes, park your car at the ferry terminal, ride you bike onto the ferry to Orcas Island. At Orcas, wait for all the cars to exit the ferry and then head out to Moran State Park and climb Mt. Constitution. Nice ride, good climb, stunning payoff.