Turtleback Mountain is a lovely forest hike with a nice summit spot for activating. Along with Mounts Constitution and Pickett, it is one of three publicly accessible summits on Orcas Island, Washington.
First get yourself to Orcas Island. Most will take the Washington State Ferry from Anacortes, Washington. For your planning purposes, note that ferry schedules change seasonally. The North Trailhead is perhaps the easier access - here directions with more information available in the links below.