The Tualatin River Preserve is a nature preserve set along the banks of the Tualatin River. The river and wetlands create a wonderful habitat for a variety of wildlife. There is a trail which wanders through the preserve, giving areas for viewing and relaxing.
From Portland, get on HWY 99 and travel West. After passing through Tigard, the Tualatin River Preserve is located off the North of the HWY.
http://www.tripleblaze.com/trail.php?c=3&i=4390