Dublin Bus run "Hop on- Hop off" Tours from their HQ on Upper O' Connell Street. The Tour has 19 stops, & is spoken through by the Driver, who can be entertaining. Tickets have a 24 hour duration, so time can be spent exploring the various locations, saving the legs & time otherwise spent walking. This tour is a good idea, if your stay in Dublin is (to be) short. Tours commence typically every 10 minutes, from 09:30 to 17:00.