Definitely a must-see. I went here last November 2011. The Chocolate Hills are truly a world wonder. This hills are actually coral limestone-karst domes, believed to be underwater millions of years ago but have been uplifted to the surface due to tectonic movements. There are two places to go to in order to have the best views of these famed national geological monuments: Sagbayan Park or the Chocolate Hills Viewdeck. Entrance fee is 15.00 PhP (.30$). There are other sites in the province of Bohol that are on the tentative list: Baclayon Church (under the inscription Jesuit churches of the Philippines, although this has been the supposed 5th church in the Baroque Churches series but wasn't accepted) and Panglao Island.