What can I do October 10 with an arrival at 2:15 pm? Don’t say rest. We don’t do that. We’ll take the train to the central station and then walk to the Hobo Hotel. Timing should be good for check in. Then what? What might be open to do? Suggestions for restaurants would be helpful. I just don’t want to waste the time before bed.
Walk to the Oodi library ( 16 min walk from hotel) enjoy the view from outside deck and unique architecture. Several other interesting buildings of note in same area.
Walk around Senate Square.
https://www.myhelsinki.fi/places/senate-square/
Visit Temppeliaukio Church. There might be a concert going on.
https://www.temppeliaukionkirkko.fi/en/index/nimi.html
ADDED: You will probably be seeing some fall colors. I was there in September 2019 and there was a little fall color, just a touch.