Tourism is a big part of Kragerø and is responsible for most of the towns income. The town is not attractive only for Norwegians but people from all over the world travel to Kragerø to witness the beautiful blue waters and many islands the municipality has to offer. The towns population is four times higher during the summer than the rest of the year due to the tourists that visit. Many Norwegian tourists that visit own a cottage or small house somewhere in Kragerø, often on one of the islands. These tourists usually have boats to get to the mainland, but there are also many ferries that drive between the mainland and the biggest islands daily.