there are some companies who do a pretty good job. you take a cruise ride with them and they take you for dolphin watching. These are my favourite:
Also, if you are coming to new zealand then you might wanna see some of NZ's natural goodness. I personally use some mobile apps to tell me places which are pretty cool places. They tell you places to do free activities, accommodation, eating joints nearby you and so much more. These apps are free to download and all the information they provide is for free. Winning!
Here is the android link: https://play.google.com/store/apps/details?id=com.hummba.guide.newzealand
Iphone link: https://itunes.apple.com/nz/app/nz-travel-guide/id635887443?mt=8
Also, check out some one day deal websites like www.grabone.co.nz. You might find some discount offers on these sites. if you are lucky, you might aswell get a discount ticket for whale and dolphin watching.
Hope you enjoy your stay in NZ. about 5 years ago