Should we bring multiple gift for our guide?

Hi everyone,
we are a group of 4 people and we have free guide scheduled for a day tour in Tokyo. I was thinking to bring a gift for everyone of us, is it too much? I don't want to offend anyone.
Also 4 is considered unlucky, isn't it?

If you come as a group, I think one gift from all of you should suffice? I mean, one guide is going to guide all of you together right?

I wouldn�ft worry about the 4 thing, but (depending on what it is but) it might be ju at to much.