The Pinery is on Lake Huron, just near Sarnia. It is a good provincial park for kids because it has toilets and running water at campsites, few mosquitoes (sandy soil that drains), a great beach, and a nice visitor centre with activities. It also is quite good for birds, with multiple nature trails through the Carolinian forest, along the river and marsh habitat, and near the beach. We've seen catbirds, orioles, various warblers, nuthatches, various woodpeckers, turkey vultures, and lots more. Not necessarily a park to go to just for birding, but a good park for families that also has birds.
-John