River Meadows Park is a great place for a nice hike that isn't too far out of town. It's about 15 minutes outside of Arlington. There are several miles of trails to explore — some of them are along the river and some are through the meadows and forest. There are campsites and yurts available if you want to explore for a little longer.
River Meadows Park
Hiking River Meadows Park
River Meadows Park