When on vacation in Mirissa, one of the top sites you should visit is the Galle Fort, which is located approximately 38 kilometres away from the city. It will take you about an hour to get there, but if you are going on a day vacation, you absolutely cannot miss going there. This fort dates back to 1588 and provides visitors with a look into the history of the area, as well as a viewpoint and many little shops to purchase souvenirs.