Some 30-minute boating away from the Con Cóc Islet, on the way to the Ba Trái Ðào (Three Peaches) Island, visitors see a pen bobbing (Bút Islet) in the seawaters. This constitutes a monument of knowledge Mother Dragon wanted to pass down to the present-day generations.

Lying adjacent to the Pen Islet is a small attractive beach. Tourists can anchor there to take a bath.