I will be in Belfast in October and want to take a Black Cab Tour. Which is the best?
Definitely https://belfastblackcabtours.co.uk
See the fifth and sixth posts in this thread for why I recommend this company over others: https://community.ricksteves.com/travel-forum/trip-reports/countryside-castles-and-celts-croatia-and-ireland-trip-report-part-2-ireland