This is the mystery box of slides. They are not numbered, so the "sequence" here is by "not obviously really stupid", and the location is, at best, probable. In addition, the slides are of poor quality, resulting in the poor colour rendition here. And given the not very interesting pictures, I have not been enthused to do much beyond rudimentary colour corrections.
I believe these are from a trip from Melbourne back to Sydney along the Princes Highway, including Wilsons Promontory - the southern most part of the mainland. Not that you can actually drive to the southern most point, but it's close. From that assumption, there are likely other photos from the Mornington Peninsula and along the south east coast of Victoria.
Maybe the Kiama blowhole. Then again, it might be some other one.