To take a stroll / to go for a wander
Bora dar uma banda no parque?
Shall we take a stroll in the park?
In gaucho speech (and older Portuguese more generally) banda meant 'side, region, direction' — preserved in fixed phrases like de banda a banda.
Falando's Idiom Trainer teaches you to recognize idiom meanings and create sentences using them, so you can speak like a Brazilian.