Kastrich Beach is generally safe for swimming during calm weather, thanks to its sheltered cove location that provides natural protection from strong currents. The water is typically clear and relatively calm, making it suitable for snorkeling. However, as a more remote beach, there are no lifeguards on duty, so swimmers should exercise caution and avoid venturing out during rough weather. The rocky areas around the cove require careful navigation when entering the water.

The best time to visit Kastrich Beach is from June to September when weather conditions are most favorable, with July and August offering the warmest waters. For fewer crowds, consider visiting in June or September when the beach retains its secluded atmosphere. Early mornings and weekdays are ideal for those seeking solitude. The shoulder months provide pleasant weather while maintaining the hidden, peaceful character that makes this cove special for couples and those seeking tranquility.

Kastrich Beach requires a short walk or drive from Sinemorets village center. While specific directions vary, reaching this secluded cove typically involves accessing coastal paths or minor roads from the main village. Some visitors choose to approach by kayak or small boat from nearby beaches. The somewhat challenging access contributes to the beach's uncrowded nature. It's advisable to ask locals in Sinemorets for current directions, wear appropriate footwear for uneven terrain, and bring supplies as facilities are limited.

Kastrich Beach itself has minimal facilities due to its secluded nature. Visitors should plan to bring food, water, and supplies for the day. Accommodation and dining options are available in Sinemorets village, a short distance away, where you'll find guesthouses, small hotels, and family-run restaurants serving fresh seafood and Bulgarian cuisine. The village offers a more authentic, low-key atmosphere compared to major resorts. Staying in Sinemorets allows access to both Kastrich and other nearby beaches.

Kastrich Beach's cove formation creates excellent snorkeling conditions with clear waters and rocky underwater areas that attract marine life. The sheltered nature of the cove typically ensures good visibility, and the combination of sandy patches and rock formations provides habitat diversity for fish and other sea creatures. The relative isolation means less disturbance to marine ecosystems. Snorkelers should bring their own equipment as rental facilities are not available directly at this secluded beach.