The Wenaha River of Northeast Oregon makes the perfect early season hike, as well as providing solitude and some great scenery.
Nisqually National Wildlife Refuge Boardwalk - Nisqually, Washington -- This used to be one of my favorite nature walks in the southern Puget Sound region. It is located just north of Olympia, WA. near Lewis-McCord military installation. Sadly they closed the 5-mile walk, leaving only the 1-mile trail. They drowned the 5-mile area and made it a bird sanctuary.
The Long Trail. The Long Trail is a hiking trail located in Vermont, running the length of the state. It is the oldest long-distance trail in the United States,constructed between 1912 and 1930 by the Green Mountain Club.