Living in Perth, I have been to
Rottnest Island.
I haven't been for many years but always went both before we married, and when we had young kids.
It was a delightful place with no cars and the huge, huge rat type quokkas that used to come in and pinch food.
Situated just 12 kms off Fremantle, it is easy to get to and we used to go by yacht, or there are ferries and/or light planes that go there.
Well,l worth a visit -I have not been to kangaroo Island.