Manly Skiff club has a wonderful atmosphere with a private room and the use of the balcony for your reception. You may like to arrive by boat.

Hire the beach through the Northern Beaches Council and Book Bosk  Restaurant for your reception

A stunning view if you are prepared to walk a little and find the Rocky outlook. Watch for wind & small children as there is a cliff nearby. Comfortable shoes & capable walkers. It's uneven ground

Boats on the Harbour - https://www.boathiresydney.com.au/c/wedding_cruises

A hidden gem overlooking Lavender Bay - Designed and Created by Wendy Whiteley in the 1990's and the venue for many loving couples. 

This is a quiet beach in Sydney's Northern Beaches. It is 350 metres long and is backed by steep bluffs. It is a steep descent  but worth the walk. Barefoot is preferable