Tourism is vital to Saint Lucia’s economy. Its economic importance is expected to continue to increase as the market for bananas becomes more competitive. Tourism tends to be more substantial during the dry season (January to April). Saint Lucia tends to be popular due to its tropical weather and scenery and its numerous beaches and resorts. Other tourist attractions include a drive-in volcano, Sulphur Springs (in Soufrière), the Botanical Gardens, the Majestic twin Peaks “The Pitons”, a world heritage site, the rain forests, and Pigeon Island National Park, which is home to Fort Rodney, an old British military base. The majority of tourists visit Saint Lucia as part of a cruise. Most of their time tends to be spent in Castries, although Soufriere, Marigot Bay and Gros Islet are popular locations to visit. The biggest festival of the year is the Saint Lucia Jazz Festival. Held in early May at multiple venues throughout the island, it draws visitors and musicians from around the world. The grand finale is held at the Pigeon Island (Saint Lucia) which is located to the North of the Island. Traditionally in common with other Caribbean countries, Saint Lucia held a carnival before Lent. In 1999, the government moved Carnival to mid-July to avoid competing with the much larger Trinidad and Tobago carnival and so as to attract more overseas visitors. In May 2009, Saint Lucians commemorated the 150th Anniversary of West Indian Heritage on the island.