在公园活动英文可以用 "engage in activities at the park" 或 "participate in activities at the park" 来表示。
"Engage" 来自中文动词 "从事"，"participate" 来自中文动词 "参与"，都可以用来表示在公园里做某些事情。
下面是一些英文例句和中文翻译：
"We pke to engage in activities at the park on weekends." (我们周末喜欢在公园里做一些活动。)
"The children love to participate in activities at the park, such as playing on the swings or cpmbing on the jungle gym." (孩子们喜欢在公园里参与各种活动，例如玩秋千或爬爬器械。)