I have never gone on one as a single person but they do seem to have all kinds if activities for people of all ages and activities tailored to different interests, such as trivia, games, karaoke, cuisine, etc... I believe you can even book special cruises where the cruise is specifically for a group of people of the same interests (such as a gospel cruise, etc.). I think a time of two on my last cruise they even have events on certain days/evenings where people can come together in one of the clubs on board (like a ladies night, LGBT, seniors, etc) and mingle with other people. If you eat in the dining room, you will most likely be sat with other people and that's a great place to bond with people over the week. It's worth a try at least once, there is definitely plenty to do and things going on at all hours of the day/evening. They can be a great place to socialize with others.