Lake Winthrop has several parks around it, all located in the town of Holliston 
Pleasure Point, Pleasure Point Road (off of Winthrop Street), Phone: 508-429-2149. Open, but not staffed, year round. Pleasure Point features a small beach and a boat launch onto Lake Winthrop. $Parking fees required "in season"
Patoma Park, Norfolk Road (before Stoddard Park Road), Phone: 508-429-2149. Patoma Park, the twin park to Stoddard Park, features mainly hiking and exercise trails around Lake Winthrop.
Stoddard Park, Stoddard Park Road (off of Norfolk Road), Phone: 508-429-2149. Open, but not staffed, year round. Stoddard Park features a beach on Lake Winthrop, a gazebo, playing fields and trails that lead into Patoma Park. $Parking fees required "in season"