DS (20yo) and his GF are having a "holiday" with GF's aunt, who live in a very beautiful part of the country. It sounds like GF's mother suggested it as a cheaper way to have a holiday than that they were originally planning. I hope the aunt is happy, I expect it's a bit of a pain when you live in a holiday area.
Anyway, DS is keen to do the right thing re contributing to costs and taking a gift. Does he offer money? I know my parents and extended family would be offended by a guest offering cash, but we don't get lots of guests decending because of the location. It's very remote, it doesn't sound like buying a takeaway or a meal out will be an option.
Wine and chocolates seems insignifianct though.