If your even thinking about going on this trip you have to check out New Zealands official travel guide!
Accommodations-
Helps you find the right place to stay, whether it’s an Apartment, Camp/Holiday Park, Guesthouse, Historic Stay, Homestay, Lodge, Motel, or Bed and Breakfast. They also provide information with numerous options on the islands of Kerikeri, Onboard, Opua, Paihia, and Russell! They provide tips and special information for several of the locations and any contact info. you might need.
Activities-
All sorts of useful contact information for Dining Out, Fishing Charters, Museums, Overnight Trips, Sailing Charters, and Tours. They include a variety of companies with their own advice all in one convenient place.
History-
If you want to take a quick look at the history of the islands of Kerikeri, Maori, Opua, Paihia, or Russell individually they provide brief histories with information that will be useful to you either for your own interest, or for your trip to the Bay of Islands.
Events-
The most convenient place to find local events, which may call for an adjustment to your trip plans!