Monon Trail Searching for an apartment close to the Monon Trail? You can’t get much closer than Sunrise on the Monon Apartment Homes, which is right off the trail. The Monon Trail is one of the busiest urban greenways in America. It stretches 18.1 miles from downtown Indianapolis to Westfield and offers residents an opportunity to get outside and exercise. Bikers will find it easy to commute by bike to downtown.