Here's a great article from Tourism-Philippines.com:
From the deeply religious Bicol region, Camarines Sur is the Philippines’ newest and fast rising tourism star with coasts and islands that greet the traveler with gorgeous limestone formations, secluded white sand beaches as well as a throbbing adventure sports scene that makes the rest of Asia stand up and take notice.
About 10-12 hours bus ride (or a 45 minute plane ride) away from Manila is the province of Camarines Sur, formerly known as Tierra de Camarines – a Spanish-founded settlement. The name was derived from camaronchones or camarines, Spanish for a warehouse/barn which referred to the small nipa/bamboo huts used by the locals of the area. Spanish Governor General Guideo de Lavezares called Camarines Sur as Los Camarines after finding a great number of camarins or rice granaries all over the area.
Read it in full Here...