The work of the agency goes far beyond the maintenance of 14% of New York City's land. Parks is the City's leading programmer of cultural, athletic and social activities, including nature walks, concerts, learn-to-swim classes, sports clinics, historic house tours, and much more. Each year Parks hosts annual events such as the WinterJam, Adventures NYC, the Pumpkin Festival and several others. In addition, Parks produces many special events, including concerts and movie premieres. In the summer, Parks' busiest season, the agency organizes free carnivals and concerts, and sends mobile recreation vans to travel throughout the five boroughs providing free rental equipment for skating, baseball, and miniature golf.