I found a great website for disabled travel in New Zealand where nearly all of the trips were designed by a chair user.
"Have a look at the free offers and Spare Seat Travel Deals page as there may be discounted seats available on the days that you are visiting.
Everything (well nearly anyway!) on our Mobility Tours has been tested by Alexia Pickering who herself is confined to a wheel chair. If we get any queries then we ask her to check it out!Click here for a planning sheet to help us design you a holiday that suits your needs.Feel free to ask us any questions.... and enjoy planning your holiday to this beautiful part of the world."
You can even join their affiliate program and make some money off people going to one of the most scenic places on earth.