There is a magical place, located on the Causeway Coast, called Ballintoy Harbour. It is known as a Dark Sky Discovery Site and is the perfect place to star gaze on a cloudless night. The harbour is free from light pollution and has the added kudos of being a Game of Thrones film location with an other-worldly atmosphere. The location is between the Giant's Causeway to the west, and Carrick-A-Rede Rope Bridge to the east. You can easily drive down to the harbour, park, chose your gazing spot on the sand or rocks and look up!
To find out more about the Causeway Coast and Glens region, please take a look at our web site: https://www.visitcausewaycoastandglens.com
It can definitely turn chilly on October evenings, especially those that have clear skies, so wrapping up warmly is a good idea.
Hope you have a truly memorable trip to Ireland!