I have ridden a bicycle since I was 3 years old and I never tire of riding into new and old areas. Just the wind on my face clears out the cobwebs in my brain and makes me feel more alive. Enjoy these five fabulous biking trails in the southwest. I know there are more, but this will get you started. 
Saguaro National Monument
Saguaro National Park in Tucson, Arizona
Known as “The Loop,” to Tucson cyclists. The Saguaro National Park biking is one of the most popular bike rides in the Tucson area. This spectacular circuit on the east side of Tucson winds through a cactus forest to the base of the Rincon Mountains.
Beautiful desert vegetation and occasional wildlife are seen, so watch out for deer, bunnies and javalina particularly early in the morning.
You can start anywhere in Tucson to add mileage to this easy ride. Also doing multiple laps is the way to go with the average time about 30 minutes for each lap, which can add up to 20 miles one way with an elevation gain of about 648 feet.
NOTE: The Saguaro National Park is a national park and does require a small $ fee to enter the park. Paying the fee is worth the ride!
PS: If you are from out of town and don’t have an annual pass wait for a local with an annual pass and ride in with them to avoid the $5 fee. The locals with annual passes can get two cyclists in per pass.
More bike trails in Arizona:
http://www.arizonabikerides.com/rides/249/saguaro-national-park-biking-tucson-arizona/
Platte river bike trail
Platte River Trail in Denver, Colorado
This 28. 5 mile trail is mostly concrete and starts in Thornton on the north end and ends in South Denver. Trail follows the Platte River. Spring and fall are the best times for biking. In summer, early mornings make for the best trail conditions. The winter weather is unpredictable, but many days are still awesome those who are well prepared and dress in layers.
With the Rockies in the backdrop and the smooth trail ahead of you, you can roll into Denver for lunch before heading north toward Henderson into high plains. The river ride turns into the Mary Carter Greenway, which continues to Chatfield State Park. From there, it connects to the five other cool trails. In between: cafes, botanical gardens and lots of parks. Info: Things to do in Denver
Breckenridge to Frisco in Colorado
bike trail in Colorado
Now, if you want to bike in the rocky mountains and take in some awesome
views, then check out Vail Pass Summit trail. The ride to the summit
is 24 miles and 1550′ of climb round trip from the Frisco Marina or Frisco’s west Main St. parking lot.
Riding from Breckenridge adds about 18 miles and 500′ of additional
climb, mostly a relatively gentle grade from Frisco back to
Breckenridge. The ride becomes difficult toward the top of the pass with
3 relatively steep, short switchbacks, but is a moderate climb from
Frisco to Copper. Visit, Summit Biking for more information.
Provo River Parkway in Provo Utah
Fifteen miles of meandering along the Provo River in Utah Lake State Park are available towards the mouth of Provo Canyon that picks up a slight gradual incline. Some short, steep climbs make it challenging at times, but its well-worth it. The reward: Bridal Veil Falls. The rushing water, which drops 600+ feet through a double cascade, is the perfect escape. Info:Utah Mountain Biking
Paseo del Bosque Trail in New Mexico
Albuquerque’s premiere multi-use trail, the Paseo del Bosque Trail, goes from the north to the south edges of the metro area through the Rio Grande’s cottonwood bosque (forest). You can be uninterrupted for 15 miles of paved multi-use trails. This trail is within minutes of downtown and other road routes throughout the area. In 2008, Sunset magazine ranked the Paseo del Bosque trail No. 1 for Top City Bike Rides.
Restrooms: Note that the only formal restroom facilities currently available on the trail are located at the Alameda access on the southeast side of the Alameda Blvd. bridge
More Info:
http://www.cabq.gov/parksandrecreation/open-space/lands/paseo-del-bosque-trail
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