St Lucia is a beautiful volcanic island with lush rainforests, undulating agricultural land and unspoiled beaches. Considerable French influence is still felt here. Castries, which is one of the most beautifully situated Caribbean cities, is a major port of call for cruise ships, which dock at Pointe Seraphine. Surrounded by hills, its large, safe harbour at the head of a wide bay is a constant hive of activity. The spacious Derek Walcott Square features the 19th century Catholic cathedral standing in the shade of a 400 year old samaan tree. There is also a colourful, bustling market.