Rio Grande Valley is one of the nation's leading food production areas, with a sub-tropical climate providing a 330-day growing season. With ports of entry to Mexico scattered along its border, it has become a major industrial and distribution center for trade with Mexico. Major corporations such as Lockheed Martin, Walmart, FedEx and T-Mobile are also headquartered in the area. A yearly influx of students on Spring Break travel to South Padre Island and enjoy the area's substantial student population from major Universities. Other major events and tourist attractions in the area include the Bird Festival, Onion Festival, Charro Day, Texas International Fishing Tournament, Schlitterbahn Beach Park, McAllen Museum, Iwo Jima Memorial Museum, Historic Brownsville Museum, Museum of South Texas and Dodge Sports Arena.