As far as squid liking to be close to the ocean, I wouldn't say that's too correct. You would be suprised how far up they will get.
Clean water is very important. Sand weed and structure are the ingredients required. Clifton gardens, cremorne point, Taylor's point, Palm beach, Jeffrey st wharf, pier 2, blues point, and a heap of others are great common spots. If your happy to search, you will find some amazingly good areas to fish that have few people. Jig selection and action is what is important with squidding.