Harrison's Lighthouse is on the fairly detailed 'tourist / driving map' we got with our jeep rental. We were able to find Husband's Road and it is at the far end of that. You pass an abandoned U.S. military base (then was used as a Barbados Correctional Facility until around 2007), which is on the left (worth a wander through there too - and a paved road takes you down to a small private beach). The lighthouse road becomes a track, but is passable for cars. We met one other couple just leaving the lighthouse when we were there, and they had a car.
The lighthouse is not open to public. Good for photos. A quick diversion as one is going to Animal Flower Caves.
Here is some info copied from a Barbados tourist website:
Harrison Point lighthouse is situated in the north-west of Barbados in the parish of St. Lucy.
Built in 1925, Harrison Point is the youngest of Barbados' four lighthouses.
It stands 26 m (85 ft) tall.
Other Barbados lighthouses are located at South Point, Ragged Point and Needham's Point.
Harrison Point lighthouse is not open to the public.
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