This travel guide is crowd sourced within an open source practice field day. It's for fun, don't hesitate to fool around. Please add here your recommendations on where you would like to guide your friends to visit. Or what to avoid, if you absolutely feel so :D
Example:
There is a nice farm with a beer garden at the river bordering Helsinki and Vantaa. It is towards NE, the airport. I often combine the visit to some outdoor day, there is nice forest parks and river walks near by the farm. At winter it has great skiing tracks. Why not go do some sport for some hours in nature, and have dinner and beers at the farm!
https://www.myhelsinki.fi/en/see-and-do/sights/haltiala-farm