In which popular seaside town is the easternmost point of mainland Australia?

I used to live ten kilometres from there in Lennox head.

Made most popular over the past few years at least by famous visitors & locals such as but not limited to Paul Hogan, Oliver Newtown-John, Chris Hemsworth & his wife Elsa Pataky. Visited by just to name a few Liam Hemsworth, Ricky Martin, Ben Harper, Matt Damon, Zac Efron, the annual Byron blues festival & Splendour in the grass.

When it said popular eastern seaside town I was looking for Southend

Easy for an Aussie.