Milton: Join other families for nature explorations, hikes, activities, and barbecue at a Family Hike and Picnic. Registration requested. Sunday, 10 a.m. Houghton’s Pond, Hillside St. Free. 617-626-1250, amcboston.org/committees/family.
Quincy: Ce-Ce and Friends Humane Society is holding its 13th annual Waterfront Walk for Homeless Animals to help end animal overpopulation. Proceeds will benefit animals in need. Sunday, noon-3 p.m. Wollaston Beach, Beach St and Quincy Shore Dr. www.angelfire.com/ma3/cecenfriends/walkathon.html.