参考范文： Dear Sir / Madam, 　　I'm writing to express my gratitude for your good service when I had my wonderful summer vacation there. The pleasant memory for my trip is still vivid. Generally speaking, the trip in Golden Bay Resort last month was splendid and satisfactory. The sand-bathing was great, with bright sunshine and cool seawater; and more satisfyingly, cozy rooms and first-class dining were beyond my expectations. I' m glad that I could return home with delightful memories. 　　The efforts of your warm-hearted staff to bring me a great beach vacation should be highly appreciated. Please convey my gratitude to your staff. Wish you a beautiful future.