你好 鑫天下1
参考译文：
Are you available (over the weekend) for a picnic in the Xishan Mountain?
Will you be free for a picnic in the Xishan Mountain (over the weekend)?
I'm wondering if you are interested in having a picnic in the Xishan Mountain (over the weekend)?
括号中可以替换成具体的时间
How about going for kite flying ?
Let's go for a kite flying.
Shall we go kite flying?
Come along for kite flying, will you?
May I invite you for kite flying?
请注意 go fly a kite 是指让人滚开,到一边去,别烦我的意思
希望对你有用
-Michael