Sending gifts following a visit to Japan

Our son is a graduate student at a university in Osaka. He has a scholarship through Rotary, and a Buddhist priest serves as his mentor in that group. When we visited our son and his family last May, the Rotary club entertained us for dinner at one of their meetings and gave us a set of ceramic cups.The priest gave us a tour of his temple and brought us fancy pastries a couple of times during our visit. He also took us to a very nice restaurant for lunch one day. While there, we gave boxes of candy from the US to the club members and to the priest, but we would like to include an additional gift for the priest when we mail a package to our son for the holidays.

We also would like to include an additional gift for a couple who entertained us for dinner in their home. They are friends of our daughter-in-law and they were very gracious hosts. Again, we took a box of candy with us that evening, but we would like to do a little more. The wife and I share an interest in weaving, so I was thinking about weaving a small hand towel for her, but perhaps something else would be more appropriate.

Do you have any suggestions for appropriate gifts in these two situation? Knowing there is a delicate balance in gift-giving,we don't want to do too little or too much. We will send nice cards for the New Year, but we need advice about whether or not to send a gift to the priest and/or to the couple who entertained us in their home.

Now here Japan is in o-seibo season.
Gifts are given to those with whom one has a relationship, especially the people who have helped the gift giver.
Drinks, candies, foods or something they love (if you know thier favorite) about 3,000-10,000 yen.
Beer, coffee, tea and ham are often given as an acceptable and hard-to-decay gift.
Here is feature page for o-seibo of some famous department store.(Japanese)
http://www.isetan.co.jp/icm2/jsp/shopping/seasongift/top.ac
http://www.mitsukoshi.co.jp/seibo/
http://www.takashimaya.co.jp/shopping/gift/wintergift/

Something from your home country would be appropriate, I think.