What would you do if you have three days off work, baddish weather and a car? (starting off from Auckland)
Thinking of heading either toward Bay of Islands or maybe the Coromandel...but know little of either place...
Both for the Bay of Islands and for Whitianga (don't bother with Coromandel Town, it's a dump) I'd much prefer sunny weather. So instead I'd say: go hiking in Whangarei. Assuming "baddish weather" includes at least a light drizzle, the rainforest there will be absolutely gloriously green and the waterfalls pretty full. The walking tracks might be a bit slippery at times, but mostly they're in very good repair, and the roof of vegetation above you should protect you from all but torrential rains.
I might also say Waitomo, but you've already been there, so that's no use...
Ooh! Or you could stay in Auckland and hang out in one of the $2/hr internet cafes all day, updating your weblog and hanging out with us people! :D
Well, it looks like I am now carless....so it's going to be the bus...but Ill defintiely look into Whangarei Sander, thanks for the info.