Wine and Dine: There are a good number of bars and restaurants in St. Julian's offering a variety of cuisines and atmospheres.
Balluta Bay: is also popular amongst visitors; it is dominated by the neo-gothic church and the impeccaple Balluta Buildings built on the art nouveau style. There are also a couple of traditional terraced houses built in the Georgian-style.
Spinola Palace: Spinola Palace was built in 1688, a building that is seen as the first stepping stone that started St. Julian's development. This palace and the adjacent gardens were built as the inscription found above the portico.
Walk along the promenade: You can take a long walk on the promenade that stretches from St. Julian's all the way to Sliema, and enjoy breathtaking views of the sea, Marsamxett harbour and Valletta. There are plenty of cafes, restaurants and bars along the way to keep you well fresh in the sunshine.
Visit Portomaso area: One of the poshest areas in Malta, Portomaso offers a number of shops with luxurious goods, high-class restaurants and a beautiful yacht marina.
Source: http://www.malta.com/en/about-malta/city-village/st-julian-s