Post in Finland

Hello. My family and I are planning to go to Helsinki on the 24th-27th. in October. I would be happy to ask for recommendations on what to see in Helsinki and 200 km away from Helsinki. We plan to go by car. we are me, my husband and three children (12, 8 and 1.5 years old). I would really like to see the countryside, hike a beautiful trail, meet a family, see an interesting museum! I'm a ceramicist, I'm interested in getting to know craftsmanns... Thank you! I will wait for the message!