have a whale of a time相当于 have a very good time，意为“玩得很痛快，过得非常快活，玩得很开心”。

【例句】
Kids of all ages will have a whale of a time at the water park.
各个年龄段的孩子在水上公园都会玩得很开心。

We had a whale of a time on holiday.
假期里我们玩得非常痛快!