This is a "trail" that connects E. Brimfield Reservoir (man-made, formed by an Army Corps dam) with Lake Siog in Holland. Because of the dam, the trail is navigable at all times of the canoeing season. The trail leads through wooded areas and extensive fresh-water marshes and has three official rest areas along the way. There are usually plenty of birds there, including Great Blue Herons that tend to lead you down the trail.
Round trip can take anywhere from 4 - 6 hours depending on stops. But it is easy paddling on a very slow moving river. It can also be done as a one-way paddle as there are put-ins at either end of the trail. (See map at put-in.)
Boat ramp with parking. Three rest stops on the canoe trail, itself, along with a beach on Lake Siog at the southern terminus of the trail.
No fees or permits required.
From MassPike exit 9 in Sturbridge. Take route 20 West towards Brimfield. Follow for several miles through the Fiskdale section of Sturbridge into Brimfield. You'll pass a boat ramp on the right. Be prepared to turn left immediately afterwards (about 1/4 mile after). There is a boat ramp there with plenty of parking. This is on E. Brimfield Reservoir. Put in and head for the river which goes under the bridge at about 2 o'clock as you look out from the put-in.
Maps available at put-in.