Grass River Natural Area Trails Alden / Bellaire / Antrim County Popular Hiking +3 Skiing Trails Walking & Running Glacial Hills Pathway and Natural Area Bellaire / Antrim County Popular Biking +4 Hiking Skiing Trails Walking & Running Ellsworth Athletic Park Ellsworth / Antrim County Popular Baseball +9 Basketball Biking Birding Fishing Hiking Skiing Tennis Trails Walking & Running Antrim Creek Natural Area Ellsworth / Charlevoix / Charlevoix County / Antrim County Popular Hiking +3 Skiing Trails Walking & Running