St Peter Port's harbour is one of the most attractive working waterfronts in the British Isles. Yachts crowd the marina, the ferry terminal connects to England and France, and the fishing boats that still work the channel tie up in the inner basin. The quayside cafés are good for watching the constant movement of boats and people.
Behind the quayside, the covered market is worth a detour. The market hall — built in the 19th century — stocks Guernsey butter, fresh crab and lobster, local produce, and the island's famous dairy products. The butter is genuinely exceptional: rich and golden from the milk of Guernsey cows, which produce milk with a higher fat content than most mainland breeds.
The High Street that runs from the harbour uphill into the town is lined with small independent shops — Norman street names mix with English storefronts in a way that feels genuinely Channel Island rather than simply British. The oldest surviving postbox in the British Isles, dating from 1853, sits near the top of the High Street in a niche in the wall — still red, still in use.