阅读下面这首宋词，然后回答问题。(8分)
鹊桥仙·己酉^①山行书所见
辛弃疾
松冈避暑，茅檐避雨，闲去闲来几度？醉扶怪石看飞泉，又却是、前回醒处。　　东家娶妇，西家归女，灯火门前笑语。酿成千顷稻花香，夜夜费、一天风露^②。
[注] ①己酉：淳熙十六年(1189年)，当时词人正闲居于带湖之滨。②“酿成”三句：谓每夜的清风白露，酿成一片稻米花香，意即风调雨顺，丰收在望。
这首词的上下片写的各是什么生活情景？请予以归纳。(4分)
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联系全词和辛弃疾的生平遭遇，谈谈对“闲去闲来几度”中的“闲”字的理解。(4分)
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