Just a short drive away from Portland, OR is one of the largest river islands in the US, called Sauvie Island. It lies between the Columbia River, Multnomah Channel, and Willamette River. On that island is Wapato Access Greenway State Park, a small state park with a 2.3 mile loop trail. It’s a great place to escape the madness of Portland. I’ve never seen it crowded. It’s a flat easy trail. I actually did 8 laps around it when I was training for a marathon.