Fly to Seattle, there are tons of hiking trails in the Mt. Rainier National Park and in the North Cascades within an easy drive of downtown Seattle. Here are some links to get you started:
http://www.cooltrails.com/list-Northern-Washington.htm
http://www.mount.rainier.national-park.com/hike.htm
http://www.nwsource.com/outdoors/hiking/