The Save Our Seafront campaign has vowed to ramp-up its efforts to prevent a jumbo cruise berth being developed in Dun Laoghaire harbour.
An eight-year planning application for the cruise berth is being considered by An Bord Pleanala.
At a recent public meeting, campaigners decided their next course of action, after making submissions on the planning application.
"We hope that the planning route will be enough for us to stop this," People Before Profit TD, Richard Boyd Barrett said.
"But in the meantime we are encouraging people to write to Transport Minister Paschal Donohoe about the upcoming harbours bill," he added.
Legislation that is being processed at the moment could see the Dun Laoghaire Harbour Company (DLHC) disbanded and the harbour brought under council control.
Mr Boyd Barret said that he will be seeking an amendment that would ensure that the harbour would be under the control of elected representatives.
Musician Christy Moore (inset), who lives in Monkstown, has backed the campaign.
In a leaflet entitled An Alternative Vision for Dun Laoghaire Harbour he has penned a short appeal.
"Let our voices be heard. Let us remember those who are driving this scheme when election time comes around," he wrote.
The "alternative vision" touts environmentally-friendly development and low-impact development.
It rules out any prospective privatisation of the harbour and wants to retain it for community use.
Meanwhile, ferry company Stena Line has announced plans to lodge a planning application to remove its infrastructure from Dun Laoghaire harbour.
Earlier this year, the company confirmed that it was pulling out of the harbour and would instead be expanding its service to Dublin Port.
Independent councillor Victor Boyhan said he was "disappointed" that the deconstruction works would soon begin and called for a replacement ferry service to be sourced as soon as possible.
The DLHC has said that it hopes to have a new passenger service in place by 2016.