Rome is my favorite city in the world.
Nightime meals in the Trastevere district is a lot of fun - good people, good food, good ambiance for the woman.
Daytime excursions, check out the Piazza Navona for good knock off handbags and more importantly, local artists gather there to sell their paintings. Paintings are rolled up and placed into paper and are easy to carry around - an excellent souvenir from Rome - I literally have a wall full of them.
Dont eat and drink at the piazza navona, its an overpriced, underquality tourist trap.
Go instead to the Campo DiFiori. In the daytime its an open air produce and flower market. In the afternoon and evening its an awesome charming square lined with patios that are great for sipping vino, eating apps, and watching people. There are charming performers singing and playing music...its more for locals than the piazza navona. Campo DiFiori is one of my favorite places in Italy to kill time and people watch.
Shop up and down the via condotti in Rome, but its all expensive boutiques. Window shop if youre on a budget but its right on the route that starts at the spanish steps, trevi fountain, and dumps you into what i think is the most visually impressive sight in the whole city (maybe next to the coliseo), the awesome Pantheon