Hello, I’m local here and hope to help out – As for the nightlife, we have a Koreatown in another neighborhood and that’s where most of Oriental style bars and karaokes, and there’s also Vietnamese restaurants there – The neighborhood is “Bom Retiro” and you can go by subway Line Blue – Tiradentes; You can also find a few “stylish luxury” brands for tennis and clothes there with unique designers such as Nike and Adidas collections. But be aware that both of neighborhood are kind dangerous to walk during night, so be careful walking around, better to visit both during daylight 🙂 As for Liberdade during the weekends and holidays be prepared to face huge crows and lines, the tent-market at the square, they sell mostly food such as teriyaki, tempurá, takoyaki, pastel (traditional fried Brazilian type of guioza – i highly recommend it !), yakisaba and also some deserts like fried ice cream! But you can also find crystals, plants like bonsai, bags, jewelry at those tent-market. I’d also recommend visiting the big galleries if you like anime, they sell figures, mangás, DVD, and other things related with it and also k-pop, cosplay, etc…