One of the best day trips you can make out of Belfast is to the stately National Trust property of Mount Stewart by the shores of Strangford Lough. This beautiful building has been home to the Londonderry family for over 200 years and the gardens have earned Mount Stewart a World Heritage Site nomination. The magical Italian garden cannot be missed. If you come on Sundays in the summer months, live jazz is played in the garden for everyone to enjoy. Stay for a guided tour of the house where you'll see Hambletonian, one of the world's 100 most famous paintings, as well as chairs from the Congress of Vienna.