This cache was left in Lammassaari after a successful geomeet. The geomeet was the the first of it's kind here in Finland. 11 people participated and had a blast!
Lammassaari is a beautiful green island almost in the middle of Helsinki. If you come by car, be prepared to walk for about 1.5 kilometers (1 mile) to get to the site. The area surrounding the cache is a bird-sanctuary of a sort, so you can't ride a bike
EDIT Jul 10 2016: Apparently you are allowed to bring your dog along as long as it is leashed and under sufficient supervision.
or walk your dog here.