Nature Treks We will be opening soon for the 2013 season. Our main location is in Iverson Park on the Plover River in Portage County and our second site is in the Hartman Creek State Park on Hartman Lake in Waupaca County. Canoe & Kayak Rentals Bike Rentals and Repair Shuttle Service & Special Treks Hartman Creek Rentals Home | About Us | Contact Info | Feedback Shuttle Service | Equiptment Sale | Kayak & Canoe Rentals | Mountain Bike Rental