There are few things you could give to Japanese. Here are a few suggestions:-(For women above 30)
1) Table runner
2) Pewter
3) L'Occitane Fragrant Touch perfume in Lavender or Rose
4) The Natural Source - Handcreams
5) Make-up pouch with make-ups stuff inside (Eyeliner, Lipstick, Lipgloss and Mirror)
6) Bangles
7) Watches
8) Scarves
9) Nice hats
(For family)
1) Red wines
2) Homemade cookies from your country
3) Any other food that is specific to your country
4) Keychains
5) Fridge Magnets
(For men : 30 above)
1) Hats (like those golf hats)
2) Keychains
3) Document bags
4) Special Mugs
5) Tea caddies
P/S: Jim Thompson store has very nice selections of items to 'gift'. Try it.