We stayed in Kampi, Helsinki & not only was everything at walking distance ( nothing more than 3-4km) but also the bus and tram connectivity is very comforting. We visited the Sibelius monument & then walked down 100 metres to visit the famous Cafe Regatta.
Our first excursion was to Suomenlinna island which housed the Suomenlinna Fort, Cathedral, museums & is a UNESCO world heritage site. You can spend the whole day here, exploring the island, dining at quaint cafes like the Cafe Piper, Cafe Vanilla etc.
One of the perks of staying in Helsinki was the cruise. You could book a cruise to Stockholm, Tallinn & other nearby cities lining the Baltic Sea. We booked a one day cruise to Tallinn & although hectic, it was worth the swollen feet! Mind you, do NOT arrive 30 min prior to departure, the Finnish are punctual people & boarding for these cruises start a good 1.5hrs ahead. They will however accommodate you in the next cruise after charging a small fee if you miss the deadline. And don't miss the statue of the Bad Bad Boy, which will be to your left when you take the tram to West End harbour.
When in Tallinn, please use the sight seeing bus if you have time at hand. Else you can take local buses to visit the various attractions like the Open Museum & the old town. Old Town is a must, lined with open air cafes & pebbled streets with vendors selling flowers ...this had a picture-postcard like charm to it. Also the Saku beer is a great option to add to the lunch menu.
Back to Helsinki, the next day we happened to come across the open air outlets put up by people on World Restaurant Day on Sunday. Every cuisine imaginable was lined up in the parks. It was a meat lover's paradise, with a few sprinkling of vegan/vegetarian dishes.
I found hunting for souvenirs a task. I really wanted to buy the traditional drinking cup of Finland, or even try the jewellery, but it didn't prove to be much of a bargain. Nevertheless I satisfied my urges by gulping down a cup of piping hot, very tasty & filling salmon soup & later on buying the famous Finnish vodka there!
In summer, the sun will be very harsh so doll up on the sunscreen & shades, but also don't forget your warm clothes for the merciless cold wind that blows. It's very economical to make a travel card which are useful for booking ferries to Suomenlinna, trams, buses, metros etc. Vegetarians beware, you'll be offered fish when you claim you don't eat meat, so pickup something from the supermarkets there.
You don't need to carry any Euros unless you plan to shop locally-for us, the only place currency was required was the open air restaurants in the park. Rest everywhere your international debit/credit card will definitely work. And by the way..Finland is known as the most honest & content country in the world. So you can just sit back, relax & soak in the city at peace.