The Heroes Village where you will begin and end your dash is situated at the top end of Pontcanna Fields, near to the Sophia Gardens Cricket Ground.
The closest postcode for the Heroes Village itself is CF11 9XR. There is parking available at the Sophia Gardens pay and display car park pictured here. On foot from there, just head towards the SWALEC Stadium or Sophia Gardens Cricket Ground. The Heroes Village will be on your right as you enter Pontcanna Fields.
Alternatively, head towards Pontcanna Changing Rooms (CF11 9HY) where there is also a car park. From the car park, turn right and walk up the wide tree lined avenue with the fields on your left. You will see the Heroes Village in front of you on your left.