A skatepark is a purpose-built recreational environment for skateboarders, BMX riders and aggressive skaters to ride and develop their sport and technique. A skatepark may contain half-pipes, quarter pipes, handrails, trick boxes, vert ramps, pyramids, banked ramps, full pipes, stairs, and any number of other trick-oriented objects.
Skateparks may be privately owned or publicly owned. Privately owned skateparks usually have admission fees, while publicly owned skateparks generally charge no entrance fee. Many privately owned skateparks are indoors, usually in warehouses, roller rinks or buildings with tall ceilings, especially in areas of the world with snowy winters. Public skateparks are almost always outdoors.
Concrete parks, now "pretty much the industry standard", according to an editor of Transworld Skateboarding magazine, can cost three times as much to build as parks with ramps and wooden obstacles, but in the long run they require fewer repairs and little maintenance
Wikepedia 2008
Above: bowl type skatepark
Above: street Plaza style skatepark.