If your trip to Greenisland is all booked but your travel itinerary is looking a little empty, let us give you a helping hand.Belfast Castle is a noteworthy attraction in this wonderful city. Stop by and discover what it's all about.Not far from the heart of the city, Carrickfergus Castle is one spot you might like to consider adding to your to-do list. Carrickfergus Marina and St. Nicholas Church are also close by and worth a detour.