I think mine is 'Go to the beach' atm, because I can't think of much else atm, and the weather is nice (how long will this last btw?? ).
I guess now that some shops are open, people can also go shopping.
Maybe picnics or visit somewhere nice? Any places or activities you like doing on Sunday?
I was sure there would be a free concert on Alppipuisto (Just behind linnanmäki), like in the previous weekends but it does not seem to be listed on hel's pages (click the link for some activities).
Ah yeah i saw something about it in one of the papers. I think its not every weekend, but alot of weekends during summer they have something different, local musicians etc .