Katharinenhof Beach is known for its clear water, making it suitable for swimming, snorkeling, and diving, though the rocky-pebble shore requires appropriate footwear. Water shoes are essential for comfortable entry over the stones. The clarity of the water and underwater features attract snorkelers and divers interested in exploring Baltic Sea marine life. Swimming conditions depend on weather and wind, as with all Fehmarn beaches. There are typically no lifeguards at this hidden beach, so swimmers should be confident and cautious. The diving access suggests reasonable depth and interesting underwater topography, but always check local conditions and dive with proper equipment and experience.

For diving and snorkeling, visit Katharinenhof Beach from May through September when water temperatures are warmest and visibility is generally best. June through August offer the most comfortable conditions, with water temperatures reaching 17-20°C. For fewer crowds, opt for weekdays or shoulder season months like May and September. The beach's hidden nature and rocky-pebble surface mean it naturally attracts fewer visitors than sandy resort beaches, making it relatively quiet even during peak summer. Early mornings provide the calmest conditions for underwater activities and the most peaceful beach experience. Weather conditions significantly affect diving safety, so always check forecasts.

Katharinenhof Beach is located on Fehmarn Island, accessible after crossing the Fehmarnsund Bridge from mainland Schleswig-Holstein. Navigate to the village of Katharinenhof using the island's road network. From Burg auf Fehmarn, follow signs toward the relevant coast where Katharinenhof is situated. A car is recommended as public transportation to this hidden beach location is limited. Parking should be available near the beach access point. The exact coastal position may require local signage or GPS navigation. Being a lesser-known beach, it may not be as clearly marked as major resort areas, so some exploration may be needed.

Katharinenhof Beach is described as hidden, suggesting limited commercial development and fewer amenities directly at the beach. Accommodation options may include holiday apartments or small guesthouses in or near Katharinenhof village, though choices will be more limited than at major resort areas. Restaurant and cafe options are likely minimal in the immediate vicinity. Visitors should consider bringing their own food and drinks, especially if planning a full day of diving or beach activities. For more substantial dining and accommodation options, the main town of Burg auf Fehmarn offers better variety and is within reasonable driving distance for day trips to this secluded beach.

Katharinenhof Beach attracts divers and snorkelers primarily due to its notably clear water and rocky-pebble underwater environment. The rocky shore creates interesting underwater topography and habitats that support marine life, offering more to explore than flat sandy bottoms. The clarity of Baltic Sea water here allows better visibility for observing fish, plants, and geological features. The beach's hidden status means less disturbance and potentially better preservation of the underwater environment. The diving access suggests suitable entry points and depths for both beginners and experienced divers. This combination of clear water, interesting features, and relative seclusion makes it a preferred spot for underwater exploration on Fehmarn.