You've found an excellent place to observe whales migrating along the NSW East Coast.

Whales migrate to these areas.

(NSW NPWS)

The majority of whales migrating in Australia are Humpback Whales. These are the most commonly spotted, though you may also see the occasional Minke, Southern Right, Blue, or Orca.

Greenpeace has some good information on whale identification (but you'll probably need binoculars to see the differences). Download the Greenpeace whale spotting guide and you might find out who's frolicking out there.