The Mattawa Voyageur Multi-Use Trail System, 12$/ day, but if the trail system is half as interesting as the descriptions make it, it's off-road haven: 3 days worth of trails with varied terrain! It is very popular with ATVs, the area being ATV friendly, dirt bikes are allowed on the trails as well.
This is an awesome area to spend some time. You can go camping in a number of places and go ride daily. There is a large number of trails, both single track and double track. Lots of places to visit, vista points - a really awesome off road paradise with plenty of dirt bikes and ATVs and adventure motorcycles.
Really recommended - spend a great many weekends there.
Tracks:embed++ Download to GPS. Or search more routes.
See more dirt bike trails.