Don ts of dating
The exchange of gifts is a central part of business etiquette and of Japanese culture in general.
If you’re visiting your host family, then anything that’s typical for your region / country (especially if it’s edible) is the best choice.
There’s the typical “omiyage” (お土産) that you’re supposed to bring back from your trip.
Gifts are also exchanged towards the end of the year (oseibo, お歳暮) to express indebtedness and midyear (ochugen, お中元) to show one’s gratitude.
These kind of presents are exchanged among teachers, students, coworkers and business partners.
You are expected to reciprocate if someone gives you one.