Morton Arboretum -one of the most respected arboretums in the nation, has an award-winning Children's Garden, Maze Garden & 16 miles of hiking trails @mortonarb P Lisle (25 miles from Chicago) a Tickets: $18 ($12 Wednesdays); purchase before visiting 17 Open daily 9am-sunset P Free Dog friendly one day each month! Next one is on 4/13! Tip: Eat at Gingko Restaurant & shop at the Arb store, both in the Visitor's Center.