Etiquette in Finland: how to fit in with the locals
Even in the midst of Helsinki, you can see that the Finns are yearning for the peace and tranquillity of the big outdoors, counting down the minutes and hours until they can escape to their mökki (summer cottage). They dress in a way that shows their love of nature: informal, practical, sustainable, and well-suited to the extremes of the seasons. There's no need to bring a lot of fancy clothes, especially if you're going outside of town (as you most likely are). Instead, bring layers, thermals, and good walking shoes.
Furthermore, do you consider kissing on the cheek when saying hello in Finnish? No. Finns are a little more cautious when it comes to greetings since they value extreme apartness. This is definitely one of the top Things about Finland You Should Know. Making eye contact and shaking hands is rather common; friends and family typically hug. "Hei" and "moi" are two different methods of saying "hello." If you say it twice ("moi moi"), it doubles as a goodbye. Oh, and remember to be on time - the Finns are always.