Cost: Free. Parking $10 Friday-Sunday and holidays; $5 Monday-Thursday. Residents free.
Hours: 6:30 a.m.-sunset daily. Visit website for marina and swim beach hours.
This 1,100-acre forest preserve offers a wide range of outdoor recreation and education opportunities centered on a 115-acre lake reclaimed from a gravel quarry. Walk, ride or rollerblade around the lake or play at the Children's Grove playground.