The bonus of the Adventure labcache Utrecht Science Park is just outside the Science Park and not on the given coordinates.
For playing an adventure lab you need the app Adventure Lab and internet
It can not be reached by car.
The cache is on N 52° 5.ABC' E 5° 10.ADE'
From here it is 1.4 km. back to the Botanic Gardens.
Good Luck and hope you enjoyed it.