What to take for a day trip depends on personal taste and destination. If you like Chinese food, you can bring some snacks, such as potato chips, dried tofu and candied fruit. If you like western food, you can bring some biscuits, chocolates, fruits and so on. In addition, if the tourist destination has special food, you can try to bring some local snacks, such as Beijing roast duck and Sichuan hot pot bottom material. The most important thing is to choose the food that suits you according to your personal taste and tourist destination, so that you can enjoy yourself in a day trip.