Dublin Bay is a large, open coastal bay on the east coast of Ireland, designated as a UNESCO Biosphere Reserve. The paddling experience here is distinctly coastal, offering views of the Dublin cityscape from the water alongside rocky shorelines, sand dunes, and picturesque beaches. For paddlers, the bay presents a mix of sheltered harbour areas and exposed coastal stretches with significant tidal currents, requiring careful planning. The bay is a busy shipping port, so paddlers must be vigilant of commercial vessel traffic, particularly when crossing channels or near the main port areas.

The most detailed information for paddlers centers on the southern shoreline near Dalkey. A primary launch point is the historic Bullock Harbour in Dalkey village, approximately 14 kilometers south of Dublin city centre. From here, a popular guided route involves paddling about 2 kilometers along the rocky coastline to Dalkey Island, crossing Dalkey Sound. This crossing and the conditions around the island can be tricky due to tidal and sea states, making guided tours advisable for non-experts. The island itself is a key destination, featuring ruins of St. Begnet's church, a Martello tower, and a population of wild goats and rabbits. The rocky outcrops near the island are a renowned habitat for seals, which are often curious and approach kayaks. The area is also home to seabirds including cormorants, gulls, terns, and herons.

For a more sheltered experience suitable for beginners, Dun Laoghaire Harbour, about 10km from the city centre, offers 200 acres of water. It is protected from almost every wind direction, making it an ideal location for stand-up paddleboarding lessons and rentals. The specific launch within the harbour is at the Coal Harbour slipway, noted as the oldest and most sheltered part. Facilities are basic; for tours, equipment like kayaks, paddles, wetsuits, and buoyancy aids are typically provided, but paddlers should come wearing swimwear and bring a towel and change of clothes, expecting to get wet. There is no mention of specific permits for recreational kayaking in the bay, but one source strongly cautions that the bay is not suitable for beginners due to strong tidal currents and shipping, recommending that experienced sea kayakers check tides, shipping movements, and weather carefully. The best time of year for paddling is generally from April to October, offering longer days and warmer water.