The Wilmington State Parks are a group of four parks in Wilmington operated by the Delaware State Park system. The four parks are Brandywine Park, including the Brandywine Zoo and Baynard Stadium, Alapocas Woods Natural Area, H. Fletcher Brown Park and Rockford Park. Admission to the parks is free, but a fee is charged for admittance to the zoo. The parks, within minutes of each other, are open year-round from sunrise to sunset. The zoo is open daily from 10:00 am until 4:00 pm, May through November. Rockford Tower and Rockford Park is open from 10:00 am until 4:00 pm on Saturdays and Sundays, from May 1 until October 31. The parks are patrolled by Delaware State Park Rangers whose headquarters office is in Brandywine Park. The City of Wilmington also operates 55 parks and recreational facilities across the city. The Delaware Distance Classic is a 15K road race held in October by the Pike Creek Valley Running Club (PCVRC). The course has rotated every few years based on sponsorship and is currently located in nearby Delaware City. The event began in 1983 as a fundraiser for the PCVRC, and the Mike Clark Legacy Foundation has been the beneficiary for the last few years. The Caesar Rodney Half Marathon is a road race held annually since 1964 on the second Sunday in March. Billed by race organizers as the "granddaddy of Delaware road races," it generally draws more than 1,000 runners from 20 states and several countries. From the starting line at Wilmington's Rodney Square, runners flow past the scenic revitalized riverfront, through Rockford Park and back to Rodney Square at the Caesar Rodney statue. Proceeds benefit the American Lung Association of Delaware. The Run for the Buds 1/2 Marathon, 1/2 Marathon Relay, and 5K Run/Walk is held annually at Rockford Park in mid-October. Proceeds benefit people with intellectual disabilities through the Down Syndrome Association of Delaware. The Wilmington Grand Prix is held annually and is considered one of the premier criterium-style bike races in the country. Now in its 11th year, it is part of USA Cycling's National Race Calendar, a collection of only the most elite races. Weekend festivities include a street festival, a time trial on Monkey Hill, criterium races in downtown Wilmington at both the amateur and pro level, a 50 km Media Fondo, a 100 km Gran Fondo, and a leisurely Governor's Ride.