Tunnel Zip Lines claims to have "the fastest Zip Line in North America!" While Spur Experiences hasn't independently verified this, we look forward to the ride.

Treehouse Island is located directly in between Olympia and Portland. This adventure starts on a scenic boat ride that takes you to the course. Treehouse Island includes six lines that get progressively more exciting as you go.

One of the most beautiful tours on this list, Zip San Juan features eight lines that fly over protected wetlands. Wave down to the otters that inhabit the lake.

Bellevue Zip Tour sits in the hills above the city. When soaring through the trees, it is hard to believe you are so close to the city. The tour offers six zip lines that run as high as 80 feet above the ground.

Adventura is part zip line and part aerial adventure park. Basically, it is a playground for adults. The adventure park includes challenging ropes courses that make for a fun workout.

Canopy Tours NW is located about an hour outside of Seattle. The course features six lines and a final 47' descent. The owners share their passion for the outdoors as they have placed signs around the course that educate guests on the various trees.

ZiplineX features eight aerial bridges and eight zip lines with the highest line running 300' above the ground. For the adrenaline junkies, ZiplineX also has bungee jumping.

Skamania has a diverse zip line course that features seven lines, three suspended bridges, and a rappel line. Skamania also has an aerial park where you can "be a tree ninja" by exploring their 19 platforms and 22 challenges.

Leavenworth Ziplines has nine total lines, four of which fly at 190 feet above the ground. Leavenworth Ziplines gets consistently high reviews for their fun guides and thrilling course.

The best in the state of Washington is Mica Moon, which is located near Spokane. Eight zip lines and two UTV rides. The views are beautiful and the course has it all.