You should go to the old market hall in Helsinki and have lunch there. It is just such an amaizing place with great shops and cafes etc.
http://vanhakauppahalli.fi/en/
I also dont know if they will have anything open yet at that time of the year but if you go to Kauppatori (big market place in Helsinki) they do these tiny vendace fishes fried whole and they are pretty awesome. But yeah might be too early as its really a spring/summer kind of place.
Lasipalatsi is supposed to be very very good but I think you might miss the blini weeks. It is quite expensive but so is everything in Finland and definitely eating out.
Ravintola Aino looks good too, again quite pricey. I might have to go there next time I go home mainly cos its got my name
![Big Grin :D :D](/styles/default/xenforo/vbSmilies/Normal/biggrin.gif)
And real blueberries are so good.
What I would do is have a day cruise to Tallinn (takes about 6 - 8h) and have the buffet on the cruise. It has some amaizing stuff and includes wine and beer + soft drinks. Although it is not great for those who dont like fish as it has a lot of fish options. Herrings, gravdlax, cold and hot smoked salmon, roe selections, mussels, whole shrimps to name a few. They have meat and vegetarian stuff too and loads of puddings but the fish selection is why I always go there when taking the cruises. They dont have english menu on the website though.
Most restaurants do good lunch and it will be buffet type of setting often, not always though. It will usually be finnish "normal" food so it is best to walk around and see what they are doing that day as its different everyday on that kind of places.
Tomi Björck has some popular restaurants but I have a feeling they might all be pretty asian themed. I know gaijin is definitely asian food.
Thats just few. Dont know if you already looked at any of the places. Also suomenlinna is a nice place to visit... I will shut up now