Talk to foreigner !

I want to improve my listening and speaking skills.So I will go to the park to talk to foreigner travelling or living in my country on saturday morning this week. It's very interesting but I feel a bit nervous. I haven't never talked to any foreigner before, so I don't know what can i talk about. Should I say HELLO when I see them or something? Can you give me some piece of advice?
Thank you so much

Do you go to Park 23/09 in Saigon. I went there to practise English with students.

Foreigners are there for travelling so you can ask questions about their trip. What do they like in your country? what do they plan to go? You can advise them some good places to go.

you can ask some questions about their country, their life

but avoid to ask questions too personal as : are you married? (too personal)