Keep a distance, 3-4 feet. It is very important to make eye contact and to keep it during your face-to-face communication. Do not touch, unless you know a person very well and know that she/he is comfortable with it. Kissing on the cheek is not the custom. Don't violate the "private" space of the person. However, you usually shake hands with both males and females when you greet people (at least in a formal setting), but not necessarily when you say goodbye, unless you are ending a formal meeting. Avoid any extreme gestures, expressions, tones regardless of how well-meaning they are intended to be. Finns are wary of exaggerations and are more comfortable with moderation in interpersonal dealings. You should come across as an open, "what you see, you get" kind of a person.
Canadian Perspective:
Informality that hasn't been earned should be avoided. It may be acceptable to touch certain people when you speak with them, but this should be avoided until you are fairly close with someone and are certain that they will not be uncomfortable with such contact. Eye contact and directness are important. Finns can be frustrated by the flowery language and indirectness of Canadian communication. Finns pride directness in work communications. I have seen many cooperative ventures almost fail because of a Canadian desire to couch bad news with language that makes it seem as though there is still some possibility that agreement could be reached. Finns would much rather receive the bad news in a direct fashion than hold on to false hope because of language that obscures true intentions. This preference for directness goes both ways: unlike most Canadians, a Finn will not shy away from giving negative feedback in a blunt and direct manner.