Okay. Well, when it comes to food and drink, you’re going to have to pay; eating at a restaurant here can be pretty expensive when compared to neighboring countries. Also, while there are of course lots of indoorsy things to do, I think the real way to enjoy Helsinki in the summer is walk around and enjoy the atmosphere of people who are happy because it’s sunny, so if it’s rainy, it can get a little dull.
The good thing about Helsinki is that you can get almost everywhere pretty easily using public transportation in about 45 minutes. However, since your stay is only a few days, I’d stick to the center of town for now. A thing you might want to know is that bums and alcoholics sometimes hang out in the trams. They’re mostly harmless, just drunk, but they can sometimes be a little disruptive. Also, in the past few years we’ve started to see Eastern European beggars, who sometimes move in groups and pick pockets on crowded trams and subways. However, on the whole, we’re a pretty safe city.
The first thing I’d do is buy a tourist public transportation ticket. They’re valid for 1, 3 or 5 days and give you unlimited travel in all the public transport in the Helsinki area: buses, trams, local trains, the subway and the ferry to Suomenlinna (not the private lines, just the Helsinki Public Transport one).
I’d take a trip to Suomenlinna. It’s an island fortress off the coast and the ferry leaves from the Market Square and takes about 15 minutes. It’s a UNESCO World Heritage Site, as well as a district of Helsinki with about 850 people living there. In summer, it’s an extremely popular picnic venue. You can buy sandwiches or whatever else from the Market Square or in the Old Sales Hall right next to it.
Another relatively short but interesting activity is to take the 3 tram, either the 3B or the 3T (same route, different directions), which is touted as the “Tourist Tram” because the route takes you past several of the most important sight-seeing locations in Helsinki, such as Senate Square and the Cathedrals, the Museum of Modern Art, and the Parliament Building. You can get maps showing the sights from the same place where you buy the tourist ticket. As a plus, the route also goes through Töölö, Kallio and Eira, so you can get out of the immediate center of the city and see a little more. Töölö and Eira are more up-scale residential areas, Kallio used to be a working-class part of town and still shows it in some ways.
You might want to buy a coffee and sit outside on the terrace of eg. Café Esplanad, which is located right on the Esplanades, which are a very popular meeting and hanging-out place in summer when it’s warm and sunny. For all your sudden “crap, I need (X) and I don’t have it right now” needs, I recommend the Stockmann department store, which has pretty much everything a person would ever require (there’s a saying in Helsinki that “if you can’t find it at Stockmann’s, you probably don’t need it in your life”).
For bars which are more for sitting down and talking, I would recommend places like Teerenpeli, Kaisla or Bruuveri (in the Kamppi shopping center), which offer a pretty wide selection of beers and other drinks compared to some other bars in Helsinki, which have the standard two or three beers and one sweet apple cider on tap.
Restaurants:
Havis is a seafood restaurant located next to the Market Square which is a little expensive and maybe also a little kitschy, but the food has been good every time I’ve been there.
Tori is located in Punavuori, which is this “hello I’m an AD/graphic designer/DJ/own my own clothes label” design district (you can get there by using the 3 tram). They have a legendary meatball dish but they’re not really known for their service.
For more restaurants on the 3 route, go to Kallio where you’ll find Luft (Aleksis Kiven katu 30) and Soul Kitchen (Fleminginkatu 26-28). I don’t really know how well they treat tourists there, but I’d assume they’re pretty happy-go-lucky about it. Luft has really great salads.
For something REALLY corny, go to Zetor, which takes the whole “Finnish tradition and nostalgia” thing to completely ridiculous levels and is quite funny for it. I took an American soul singer and her assistant to eat there a few years ago when she was performing at a music festival here, and they loved it.
This any help? 