In St. John's, the capital city of Antigua, farmers markets, candy- colored architecture and the ruins of sugar plantations vie for attention with a kaleidoscope of coral reefs and sailing adventures. Salute the white baroque towers of St. John's Cathedral that dominate the skyline before joining the flocks of cruise passengers on a Heritage Quay shopping excursion. To experience the island's early cultures, visit the Museum of Antigua and Barbuda, housed in a 1750s colonial courthouse.