Not everyone welcomes exchange students for altruistic reasons. I did a semester abroad in college. The host that I and another student lived with had exchange students because her adult children didn't want her living alone - she had diabetes. We did once have to call one of her children late at night when she had a blood sugar episode. She sometimes complained about us costing her money. One time she took us to her home in the country, but otherwise we were left to our own devices as far as exploring the city, etc. At least we were in college, so we could be more independent than high school students.


Anyways, I think it's great that you want to do some activities with them and make their time in the US more special. I'm sure they will appreciate it.