What to buy in Japan as a thank you gift for a Japanese person?

We didn't bring much with us from Scotland and now are regretting it – we are meeting a volunteer guide in Tokyo next weekend for a tour (not a "free walking tour" so no tipping) so need a thank you gift to substitute the lack of Scottish presents. Does anyone have any tips for what we could purchase? We are currently in Takayama and will be in Tokyo for a few days before meeting the guide.

by checkmeout28