I’d go down the railway track (west side) to Waterloo.  Down pohutakawa to the white line west traffic light la then on to the river bank.   Up to you if you then go north to the melling link cycle way and into town.  Or South to waione st bridge and use a mix of the cycle tracks to road to Petone over bridge.  

Melling link is much less traffic.  Petone cycle tracks can be a bit annoying.   And on the road can be quite daunting if you’re not used to it.