The road to the Port Bickerton lighthouses was recently washed out and replaced after a fine North Atlantic storm rolled through the area. I wouldn't recommend the road for too many vehicles as it was a rough one. As for the spot, they do a $3 info tour in lighthouse #1. Basically the locals are trying to support the upkeep of another Nova Scotia lighthouse.
Talking to one of the guides - she mentioned Country Harbour's Ferry and I joked about just driving through the water to the other side. She explained that the large shrimp boats cruised up their and it would probably be too deep. These boats sail to Greenland and catch up to 800 tons of shrimp on a single trip.