What should I pay attention to when traveling to South Korea and taking a cruise?

Consumption: Dual-currency credit cards with VISA or MASTER logo are required on cruise ships, UnionPay cards can be used in duty-free shops for shore sightseeing, and duty-free shops can copy the first page of passports in advance. Some small shops and stalls in the scenic spot need won cash, and there are exchange points at the won pier. Clothes: In addition, according to the season you go, bring a slightly thicker coat. Summer is due to indoor air conditioning, and other seasons are due to the temperature difference between morning and evening. Medicines: Please bring your doctor's advice for prescription drugs. Other drugs are directly consigned. Daily necessities: rain gear, sunscreen products, toiletries, slippers. At the captain's dinner and dinner in the main restaurant at night, you should try to dress up, and shorts, slippers and sandals will be rejected, which is embarrassing.