A handy app for exploring trails at GSMNP is “All Trails”. The attached photo is of me hiking Alum Cave Trail last October! Parking could be challenging during this popular time of year, so you may want to check out shuttle services: https://www.nps.gov/grsm/planyourvisit/shuttles.htm
Otherwise, a $5 parking tag is required and can be purchased a variety of ways: https://www.nps.gov/grsm/planyourvisit/fees.htm
Send me your questions !