The Nobel park is an arboretum - all trees that grow naturally in Sweden can be found in this park (with the exception of one species of birch that can only be found in the mountain regions in the north and for which the climate conditions in Stockholm are not ideal).
In the late 1800s and early 1900s there were several proposals of buildings for this park (many of which quite monumental in nature). Those plans never got realized though, and this remains a nice (albeit small) piece of forest in central Stockholm.
The park is surrounded by several embassy buildings (and ambassadors' residences), the one closest to the park belonging to the embassy of Israel since 2011, when they took over the premises that once used to host the Swedish Institue of Forestry.
North West of the starting coordinates there are some stairs leading up to the hill. If you walk the full set of stairs, how many steps are there? (X)
When you arrive at the starting coordinates you will see a big rock that has been split into a number of big pieces. How many? (Y)
Finally, if you take a little walk along the water you will find the cache at N 59° 19.9(76/Y) E 018° 06.7((X+1)/Y)
Happy caching (and please put the cache back on the hook after you are done logging)!