在英文中，要表达“今天打算去玩吗”的意思，可以使用以下表达方式：
"Are you planning to have fun today?"
"Do you have any plans for fun today?"
"Are you going to do something fun today?"
这些表达方式都可以用来询问对方是否有打算在今天做些有趣的事情。
例句：
"Hey, are you planning to have fun today?"（嗨，你今天打算去玩吗？）
"Do you have any plans for fun today? I'm thinking of going to the beach."（你今天打算去玩吗？我在考虑去海滩。）
"Are you going to do something fun today? I heard there's a carnival in town."（你今天打算去玩吗？我听说镇上有个嘉年华。）