Nice bay, However its the same distance from Adelaide (740 klms) as it is to Melbourne.And when you‘re snorkelling. Baird Bay (SA) is a great spot for this. Seals, too.
My favourite getaway is the 9 hr drive to Mel. Get there a 5 pm. Leave on the ferry for Tassie at 7.30 pm. Get booted off the ferry at 7.am and drive 4hrs to Hobart Town. Did it three times last year.