Seattle offers many options for outdoor adventure and exploration. The Wenatachee River offers a day long rafting expedition. The Wenatachee is a safe bet for a family as the terrain is not super extreme, but more undulating. If you want true adventure you could tackle the Skykomish River. The Skykomish offers Class IV and V rapids. Contact Alpine Adventures at 1-800-Raft-Fun to set up a daylong adventure on the Rivers of the Seattle area.