Don't limit yourself to only Belfast in the North. Go up the coastal route to the Causeway coast. Stunning coastline with the Giants causeway , Carrick a rede rope bridge, Ballintoy harbour and White Park Bay all very close together at the end of the route. Other end of the North...Newcastle and the Mourne mountains and views of both from Murlough beach.
I must declare an interest...I'm from Northern Ireland.
Regards
Richard