Most visitors racing towards Skye or Glencoe never think to turn west towards the Firth of Clyde — and that's exactly the appeal of Rothesay, the main town on Scotland's Isle of Bute. It's barely an hour from Glasgow by train, yet it delivers the kind of quiet coastal Scotland that busier hotspots lost decades ago.

Start with the castle. Rothesay's circular 13th-century fortress grew up as the ancestral seat of the Stewart kings and changed hands between Scots and English through repeated sieges before falling to ruin after the 17th-century civil wars. Today you can explore the keep and courtyard, climb the battlements for views over the rooftops, and walk the moat beneath the curtain walls.

The town itself is a relic of its Victorian seaside heyday, when Glaswegians flocked here by steamer. Along the waterfront you'll find one of the stranger surviving curiosities: a 19th-century public toilet block with mosaic floors and decorative tiling, still in working order and open for a peek. A short stroll away sits the Art Deco Rothesay Pavilion from the 1930s, a sharp contrast in style.

Then there's the food. Local boats still supply the island's kitchens, and Rothesay punches well above its size. Rumours Bistro does homemade fish pies, pan-fried sea bass and a king prawn Goan curry; The Kettledrum is the pub option for scampi and battered haddock; Zavaroni's Café is the go-to for fish and chips eaten overlooking the water. The Cast&Creel pop-up seafood shack grills langoustines and serves hand-dived scallops sourced from the waters around the island, plus Cullen skink and smoked kippers — check its Facebook page for current locations. Finish with a gin infused with local oysters from the Isle of Bute Distillery in Bute Yard.

With a car, the island opens up fast. Mount Stuart House, ten minutes from town, is a lavish Gothic Revival mansion with a grand Marble Hall and 300 acres of gardens that hide a Victorian rock garden and a private beach. For sand, head to mile-long Ettrick Bay on the west coast (12 minutes away, with a café and toilets, looking out to the Isle of Arran), or wilder Scalpsie Bay to the southwest, where the reddish sand draws seals and the crowds don't. These aren't showpiece beaches on the scale of Harris's Luskentyre, but on a good day you may have them entirely to yourself.

Getting there is simple: take the train from Glasgow to Wemyss Bay, then a 35-minute CalMac ferry to Rothesay. Foot passengers can just turn up, but if you're bringing a vehicle, book ahead — deck space is limited.

Bute suits travellers who want heritage, walks and good seafood without queuing for them: a weekend is plenty, and a day trip works if you're based in Glasgow. It's a gentler, cheaper and far quieter slice of the Scottish coast than the usual itinerary suggests.