The hook
A road that climbs out of the sea and runs along the top of headlands for 300 km around a Nova Scotian island — best in the first week of October, when the maple and birch on the highlands turn and the whole loop goes orange.
01Why it's worth it
The Cabot Trail is one of the few drives that earns the superlatives attached to it. On the western side the road is cut into cliffs above the Gulf of St Lawrence, rising over French Mountain and MacKenzie Mountain with the water a long way below; on the eastern side it drops into coves and fishing villages. In between is Cape Breton Highlands National Park, a plateau of bog, barren and boreal forest with short trails running out to the cliff edge — the Skyline Trail, a boardwalk along a headland ridge, is the one everybody walks, at sunset, often with moose in the scrub beside it.
Autumn is the reason to time it. Nova Scotia's colour peaks around the first two weeks of October, later than New England, and the highlands hold hardwood stands that turn hard against the spruce and the sea.
The island's other layer is cultural and genuinely unusual. Cape Breton kept Scottish Gaelic longer than almost anywhere outside Scotland, and the fiddle tradition here is living rather than curated — square dances and kitchen sessions still run through the summer in community halls along the trail. The western shore around Chéticamp is Acadian and French-speaking, a different culture again within an hour's drive.
At the eastern end, the Fortress of Louisbourg is a vast reconstruction of an eighteenth-century French garrison town, staffed by costumed interpreters. It is a good day out and it is unambiguously a tourist operation; the r/travel comment that recommends it says so in the same sentence.
02How to experience it
Drive the loop counter-clockwise so you are on the ocean side going down the west coast. Give it three or four days rather than two — the point is the pull-offs. Walk the Skyline in the evening, look for pilot whales off Pleasant Bay in summer, and find out whether there is a square dance on while you are there. Book ahead for October; the colour weekends fill.
From the locals
The recommendation in the r/travel Canada thread comes from someone on the East Coast, and it is specific about season and campsite rather than general: "Cape Breton has some beautiful sights. The Cabot Trail is gorgeous during the fall, but it's also very nice during the summer time. There's some great swimming spots and hikes. If you're staying along the Cabot Trail and camping, go to Dunvegan — best campsite on the island by far."
On Louisbourg they are useful precisely because they do not oversell it: "the Fortress of Louisbourg is definitely worth seeing as well. It's EXTREMELY touristy, of course, but it's still nice."
The standing caveat for the whole country applies here too, from a Canadian in the same thread: "it's unfortunate, but travel in Canada is expensive," and distances are larger than they look — Cape Breton is a five-hour drive from Halifax before the loop even starts.