...Wandering Home Adventures... Become a McLean County Thru-Adventurer! The term ‘thru-hiker’ identifies individuals hiking the entire length of a long trail like the Appalachian Trail or Ice Age Trail. National Parks have the National Park Passport where people can document their travels to each park. Let’s give these a Heartland twist. Try experiencing every outdoor area in McLean County and become a McLean County Thru-Adventurer! Get your McLean County checklist by clicking here.