Have you contacted Plunket?
They could put you in touch with a PIN group for the age of your child.
The arena at Porirua has kindy gym which is good
http://www.terauparaha-arena.co.nz/P...ool-Programmes also there is a playgroup at Early Impressions
http://www.johnsonvillecommunitycent...lar-activities this is also where my daughter goes to creche once a week, it has a great reputation & she loves going, $29 for 8.30 to 12.30 there was a bit of a waiting list for the playgroup but that was a while ago now.
Tawa also has a playgroup on Thursday mornings which is good & gold coin donation, I think it's 9.30 start, let me know if you want more info as I'll have to drive past it to see the name of the church again.
The community centre may be the place to have a look & the library, they do story time too. Hope this helps a bit, if I think of any more I'll let you know but PM me if you want anything further