Bird lovers, the blue heron rookery is back along the North Branch Trail. It's marked in blue the map, and viewing spots are circled in red.
From Lake Avenue, take the trail north. After you cross the bridge over the East Fork, North Branch, Chicago River (aka Skokie River, but before you get to Happ Road, look to your left up in the trees.
You can see more if you turn north where the trail splits just east of here, before you get to Happ Road. There is a lot just south of a cell tower where the path turns.