My parents celebrated their 30th anniversary by revisiting their honeymoon destination.

honeymoon 是复合词，由 honey（蜂蜜）和 moon（月亮）组成。honey 象征甜蜜，moon 代表时间周期，合起来指"蜜月"，即新婚夫妇在结婚后立即度过的甜蜜假期。