The Shawnee TRAILS Act requires the Secretary of Agriculture to designate and maintain at least 20 percent of all trails in the Shawnee National Forest specifically for recreational vehicle use, including electric bicycles and off-highway vehicles like ATVs and dirt bikes. The bill directs the Forest Service to manage these trails to ensure they remain in good condition for recreational riding while also minimizing damage to natural resources. The legislation requires that at least one vehicle-use trail stay open at all times for this recreational purpose. The bill affects recreationalists who use e-bikes and off-highway vehicles, as well as the Forest Service, which manages the Shawnee National Forest in Illinois. No specific funding amount or implementation timeline is included in the legislation.