郊游，是人们一种为亲近大自然，离开自己居住的地区，前往郊区或近郊的短程旅行。活动旨在欣赏大自然之风景，认识生态，进行野餐，呼吸一下新鲜空气，轻松自身。

郊区自然没有完善的交通网络，所以一切路程皆以步行为主。由于郊区设施缺乏，山路崎岖，体力劳动大，所以旅者设置路线之时必须量力而为，最好三五成群出发。也要留意天气预告，小心计划行程及熟悉旅程路线，结伴同行。带备适当后备衣物和必需物品，例如地图、指南针、食水、食物、电筒、雨衣、雨伞、收音机、急救药箱、哨子、流动电话、对讲机、记事簿和笔等。

郊游最常见的意外是中暑，也有因为迷路在山林中徘徊，从此被山林吞噬。所以郊游时千万注意人身安全。

A picnic is an excursion at which a meal is eaten outdoors (al fresco or en plein air), ideally taking place in a scenic landscape such as a park, beside a lake or with an interesting view and possibly at a public event such as before an open-air theatre performance, and usually in summer. Descriptions of picnics show that the idea of a meal that was jointly contributed and was enjoyed out-of-doors were essential to a picnic from the early 19th century.