Talking to foreigners

I could say that where I live running into foreigners in the streets is not one of the most regular things. But if you live in a big town where it is routine to go out and be confronted by foreigners asking you for directions or just zipping around, it is very important to know how to get the conversation going. If you're an English student, this is even more important. Not only will you root for that to happen, but need to make it happen in order to get some practice.
But let's suppose you've got this foreign friend who's just arrived in Brazil. He is very excited about everything he's found so far but need someone to guide him to the right places. You feel like there is a whole bunch of other options for him to get know yet and might wanna say somethhing like this: you have to try.../you know where you should go? There is a... and the name of the place recommended. To make things easier, let's imagine you're in Rio de Janeiro, one of the most sought tourist destinations. Your foreign friend must have visited Christ, the Redeemer. On the other hand, you've tried some other less known places that in your opinion are worth visiting. To make sure your friend hasn't heard of those places you're about to recommend, you might wanna ask: where have you been in Rio de Janeiro? After his answer, you can add: have you been anywhere else? Make sure you go to... And the place. If he tells you he's been there already, you're gonna wanna know what he thought of it by asking: how did you like it?
Sometimes, if the foreigner is not very resistant towards our language, he might have learned some Portuguese. To make sure, you ask: do you know any Portuguese yet? How's your Portuguese? Finally, to keep in touch with him, maybe you wanna give him your phone number by saying: let me give you my phone number. Call me and we'll do something. You could even suggest this: it would be my pleasure If I showed you around the city. Welcome!