Here are a few polished title options that reflect both the hiking event and the invasive species volunteer work, aligned with your synopsis:

– The Environmental Impact of Community Hikes and Volunteer Invasive Species Management
– Trails and Tactics: How Community Hikes Support Local Conservation
– From Footpaths to Forests: The Environmental Benefits of Community Hikes and Volunteer Restoration
– Hikes for Habitat: Community Walks and Invasive Species Volunteers in Action
– Conserving Together: The Role of Local Hikes and Volunteer Management in Ecosystem Health

If you want a shorter, punchier option:
– Trails and Treasures: Community Hikes Meet Volunteer Restoration

Would you like any of these tailored to a specific publication style or audience?