I need accomodation in Kangaroo Island South Australia for my family and friends from May9-12th this year HELP

Basically bunks are not so good as my grandparents and my parents wont sleep on them, but fine for my friends... ideally i want somewhere to stay close together but not necarily in the same accomodation. For example, a few houses one for family and one for friends. I can access the tourist park site and the sealink site etc so please dont just post those links.. im after someone who is familiar with the area and the accomodation- i'd like it as cheap as possible for 15-20 people, approx 4-6 people per cabin/rooms :)