Well, it's finally cool enough to start enjoying the outdoors again, and what better way than by bike.

Now, that the leaves have started to change color, take a bike ride along some of these fantastic outside-the-perimeter scenic bike routes.

4573 Mavell Road, Smyrna. 770-528-8800

Along this 12.8-mile stretch of the Silver Comet Trail, you'll meander through beautiful trees and across quaint pedestrian bridges. Built across old railroad lines, this trail offers a relaxing biking experience along flat, paved trails perfect for any ability level. Make sure to bring your lunch - you'll find many picnic tables and benches along the path.

Access at 3001 Bells Ferry Road NE, Marietta

This 7.9-mile trail provides bikers with a gorgeous green space to hit the trails within close proximity to restaurants and shopping. Since this trail connects to the Kennesaw Mountain Battlefield Park trail system, you'll experience a rainbow of fall color throughout your journey.

3787 Klondike Road, Lithonia. 404-998-8384

For a longer fall bike ride in DeKalb County, the Davidson-Arabia Mountain Nature Preserve provides over 30 miles of paved trails perfect for an autumn adventure. These trails wind along bubbling creeks, through colorful forests and past rushing rivers within a 2000-acre preserve.

3232 Juhan Road, Stone Mountain. 770-978-5270

Stretching 12 miles along smooth ground, the Yellow River Park trail system follows a stunning river that will provide you with the picturesque fall bike ride you're looking for. You'll even see a few small waterfalls along the trail, which is located between Snellville and Stone Mountain.

Access off of Haynes Bridge Road, Alpharetta

In Alpharetta, bring your bike to the Big Creek Greenway for a festival of fall colors. Yellow, orange and red leaves will abound along this stunning stretch of trail. This 6.1-mile portion of the trail will take you through the Big Creek flood plain and under a lush forest canopy.