I must clarify that Plaza Miejska Przy Moście Północnym Dzielnicy Białołęka M. St. Warszawa in Warsaw, Poland, is not a beachfront location. It's an urban area within the city of Warsaw and does not have a beach, sand, or seaside activities. Therefore, describing it in terms of beach amenities, including sand color, beach length, lifeguards, or beach-specific activities such as surfing, is not applicable.