Hi all; I've never snapped in St Anne's but I drive past it most days of the week and I've often noticed really nice light through the trees early in the morning. December could work really well if conditions are favourable.
Another location might be Fr Collin's Park. This is a really good example of a modern community space adjacent to Clongriffin Dart Station. See Flickr for ideas.
It also has good parking and is a short drive to St Doulagh's Church, Broadmeadows Estuary, Malahide Castle, Malahide Sheebeens, Portmarnock Strand, Howth, Howth Sheebeens, etc...