The geocache is NOT hidden in the posted coordinates, but a short walk away. The posted coordinates will take you to the carpark. All the information you need is within 30 meters and can be seen from the carpark. There is no need to enter any building. Children will certainly be attracted to the playground. However, if you are geocaching alone, the deck tables and chairs outside the library is the perfect place for you to work out the GZ. You can take advantage of the free Wi Fi too.
The geocache is located at
S27 3A.BCA E153 02.DEF
where
A = number of white pencils
B = number of white pencils + number of blue pencils
C = number of black pencils
D = number of orange full arches in the playground
E = number of letters of a big white word on a gray wall - number of swings
F = number of swings
This is designed with the ability of children in mind. If you like to be sure you have it correct, this is the check sum A+B+C+D+E+F=23