Benagil Cave, a stunning sea cave near Carvoeiro, Portugal, is primarily accessible by boat, kayak, or stand-up paddleboard, as direct land access is not permitted and swimming is often discouraged due to strong currents and boat traffic; guided tours are highly recommended for safety and an optimal experience, typically costing between €20-€50 per person for a 1-2 hour excursion. While solo kayak or SUP visits are possible for experienced individuals, a guided option ensures navigation and compliance with local regulations. The best time to visit is during calmer seas, generally from spring to early autumn, with early mornings or late afternoons offering fewer crowds and better light for photography of its iconic 'eye' skylight. Visitors should wear swimwear, sun protection, and consider waterproof bags for valuables, remembering that time inside the cave itself is usually limited to manage visitor flow.