Explore and learn about nature while having fun with Heller Naturalists in the outdoors. For All Ages events, you do not need to register your child 2 and under; however please notify us at 847.433.6901 if you are bringing your young child. FEE IS PER PERSON. Children must be accompanied by a registered adult. Highland Park Hikers #32016-18 is located under Nature Family Adventure Programs. Just click on 'Special Events With a Fee' in the left-hand column and then choose 'Heller Nature Center' below it!