First of all, go to
www.can.com.sg and locate PSA Building with this postal code, 119963. Scroll down th map and you can see Labrador Park. This will give you an idea of how the place is and how far you have to walk.
The nearest bus-stops to Labrador Park are the ones at PSA Building. There are 4 of them. 2 along Pasir Panjang Road and another 2 along Alexandra Road.
The 2 bus-stops along Pasir Panjang Road have bus service; SBS 10, 30, 51 & 143, TIBS 176 & 188.
The 2 bus-stops along Alexandra Road have bus service; SBS 51, 93, 97, 100, 166 & 507, TIBS 61, 521 & 963.
The walk from any of these 4 bus-stops to Labrador Park takes about 10-15mins.
There is also a small hawker centre with 10 stalls at the start of Labrador Villa Road. They have very nice Malay food there.
Cheers!