Whitewater rafting
Is extremely popular on the many rivers, particularly the snake river.
Gray whale watching
Is good along the coast in spring and fall during their migration.
Killer whale watching
Is excellent in the san juan islands from spring through fall.
Sea kayaking
As a sport began in the pacific northwest and there are thousands of miles of convoluted shoreline to explore, especially in the san juan islands and puget sound of washington.
and
Hiking and Backpacking are very popular throughout this region, especially in the Cascade mountains. The Pacific Crest Trail is a very long trail that starts in British Columbia, heads south through the Cascade mountains to California; other opportunities for hiking/backpacking can be found nearly everywhere.