Coffee House Loop Trail This 2.4-mile loop trail near Douglas, Massachusetts is generally considered easy and takes an average of 49 minutes to complete. The trail is well-marked with blue tree markers, ensuring easy navigation. The loop explores shaded hardwood forests, historic pathways like the Midstate Trail, and the tranquil waters edge of Wallum Lake, blending rocky sections, wetland boardwalks, and wildlife sightings. The trail is horse-friendly, so be mindful of horse dung. A fee to enter Douglas State Forest applies from mid-May through October.