One of the major tourist areas in St. Lucia, Castries, is a port of call for cruise ships. They dock at Pointe Seraphine, to the north of the harbour, which is also a duty-free shopping centre. Beaches are also a major draw for tourists, and there are several in or very near Castries. The city doesn't have a huge amount to offer visitors, and it's usually just a place that you'll pass through on your way to the more obvious attractions of Saint Lucia - but it's worth watching those marvellous cruise ships that visit Saint Lucia dock!
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