One of the best ways to experience the outdoors in Seattle is to go mountain biking. One of the reasons mountain biking is so great is because it is so accessible. There are numerous trails that are suitable for all types of skill levels. I mean, with the Olympics on one side and the Cascades on the other, the hard part can be actually picking one to ride.
There are many websites out there that can give you a good idea on where to go for some good mountain biking trails, but if you’re interested in some ideas for some good trails right away, you can check out the following (most of these are within 20 minutes of Seattle):