A visit is highly recommended
The city is amazing, mountains and ocean at the same place. The atmosphere that this town offers is unique in the world. There are a lot of place to visit even if you have just few days but don't run, enjoy the city itself, take a coffee in the center or at Waterfront, visit the peninsula and stay some hours with penguins, they'll make you feel in peace with the universe!
Insider Tip:Pay attention in the center, in particular close to market or train station, a lot of people ask money and they are oppressive, be hard and don't be scared otherwise they follow you at home!