It is hard to believe this forest is so close to the city. With miles and miles of walking paths, Forest Park has room for bicycling, picnics, hiking and more. Known as the largest municipal park in the nation, its nearly 5,000 acres offer space for everyone and it is a favorite jogging spot for Portlanders. The centuries-old fir trees, clusters of sword ferns and other mature plant life make it a nature experience worth having.