The Dunboyne Castle Hotel & Spa is located about half an hour northwest of Dublin's city center. The historic property -- an 18th-century castle turned Georgian house, turned convent, turned hotel -- sits on beautiful green grounds, making it a popular spot for weddings and events. The 145 rooms are spacious and modern, though lack any wow factor in the decor department. However, linens are crisp, there is free Wi-Fi, and the castle offers 24-hour room service. Additional room amenities include electric kettles and safes, and suites have luxurious soaking tubs. The biggest highlight here is the spa, with its serene hydrotherapy pool, outdoor hot tub, and variety of treatments. A lovely lobby has plush seating and a fireplace, and the fitness room is adequate. The location may be out of the way, but with a library, restaurant, three bars, and several golf courses nearby, there is plenty to keep guests entertained.