If you want to visit the West Coast of Northland (and you should, it is amazingly beautiful and peaceful) Opononi is a great place to stay. Margaret's Guest House has a gorgeous view, is strategically located for visiting other sites in the area, and it is well set up for the traveler. Margaret is a wonderful host and is available to answer questions and help with anything that may come up. She knows the area well.
Things not to miss while you are there: The Waipoua Forest. Thai food at the Thai Landing Cafe. The Museum in Omapere to learn about the area's history. And on your drive up stop at the Kauri Museum, it is well worth the time. There are many other things to do but these are four that we really enjoyed.