 The caverns, however, are only open by guided tour from May 1 to September 30 and for holiday tours during December.Available activities and amenities include amphitheatre, bicycling, bird watching, camping, restrooms, camper dump station, fire rings, fishing, hiking, mountain biking, kennels, kiosk and information station, cabins, parking, photography, picnicking with tables, playgrounds, retail firewood, ice, trails, freshwater, and wildlife.Guided tours of the caverns are available from May 1-September 30.