Duncan is home to a variety of trail. Most flow down hill generally from the NE to the S and Sw. Trolley plunges down a power line cut, sweeping back and forth through big berm turns. Central starts at the E end and flows downhill mostly. at the end you can do an easy loop called Thomas (blue on maps) or circle back to the top on double track called COG, single track called Northern. Northern flows best going either way from parking lot. the other trail is Monorail very intermediat all over a good sized hill.