When packing for your trip to Mexico, think about the climate and the activities you will be participating in. Lightweight and breathable clothing and comfortable walking shoes and sandals are recommended. Sunscreen, insect repellent and a hat are essential for outdoor activities. If you are traveling in mountainous areas, pack a sweater or light jacket. It's also a good idea to carry a small backpack or fanny pack for daily excursions. Don't forget to pack any important medications and a copy of your passport and travel documents.