From Belfast

Ardglass is about 30 miles (50 kilometres) from the centre of Belfast. 
Start out at Belfast, follow the signs for Newcastle (A24). This will take you onto the Saintfield Road which takes you to Carryduff, follow signs for Downpatrick (A7).
Go through Saintfield  (A7, 11 miles). Go through Crossgar  (A7,17 miles).
Go through Downpatrick (23 miles) and follow signs for Ardglass, it is signposted B1.
On arriving  at Ardglass, drive by Ardglass North Harbour and Ardglass Marina.
Drive by children’s playground. 
Lukes Port cottage is the  first house on right side after playground.