The towns along the south shore of the Clyde estuary don't get much visitor traffic, which is fair enough — they're not obvious tourist destinations. But they have their own histories and a certain unpretentious character that's worth knowing about if you're in the area.
Paisley is the largest and most significant of them. The town has a complicated relationship with its own identity — it's close enough to Glasgow to be absorbed into its orbit, but it has its own distinct history and is trying harder than most to tell it. The Paisley pattern, the teardrop textile design that became one of the most recognisable motifs in the world, came from the town's weaving industry and is genuinely fascinating as a story of globalisation and cultural exchange. Paisley Abbey is worth seeing — a large medieval church with a long history and the tomb of Marjorie Bruce inside it. The town centre has been through the same decline as many post-industrial towns but there's investment going in.
Greenock, further down the estuary, was one of the main departure points for Scottish emigration over two centuries — a huge number of the Scots who ended up in Canada, Australia and New Zealand left from this harbour. James Watt was born here, which the town notes with appropriate civic pride. The Custom House on the waterfront is an impressive building. The Cut, an early 19th century aqueduct and reservoir up on the hillside above the town, is an unusual bit of engineering infrastructure worth the walk up to it.
Gourock is at the point where the Clyde widens into the firth — a small, functional town with a ferry to Dunoon and good views across the water. The outdoor swimming pool at Gourock is salt water and heated, maintained by the community and consistently popular despite the climate. It's the kind of thing that wouldn't exist if it were built today.
Helensburgh, on the northern shore where the firth meets Gare Loch, is a more comfortable proposition — a Victorian resort town with wide streets and a genteel atmosphere. Hill House here is one of Mackintosh's best buildings and is managed by the National Trust. It's worth making the trip specifically for it. The town was also the birthplace of John Logie Baird, who invented television, which tends to be a useful conversation piece.