Rocher du Diamant, or Diamond Rock, is a dramatic volcanic island offering stunning views, primarily accessible by boat for close-up viewing, snorkeling, or diving, as landing on the protected rock itself is strictly forbidden due to its natural reserve status and dangerous currents. Visitors can enjoy free panoramic views from various points along the Martinique coastline, while guided boat tours, typically costing €40-€100+ per person for half-day excursions, provide the best opportunity to explore its underwater caves and vibrant marine life. These tours are highly recommended for safety and local insights, especially given the strong currents. While accessible year-round, the dry season (December-May) offers calmer seas and better visibility for water activities, though tours may be subject to weather conditions during the wet season. A typical visit duration ranges from 15-30 minutes for shore viewing to 2-4 hours as part of a boat tour, making it an ideal destination for history buffs interested in its Napoleonic era past and nature enthusiasts alike.