I don't think I'd go with #1. It could be construed as an attitude problem, whereas the others show things that are pretty common learning experiences. I'm also not sure having applied to the UG and not gotten accepted works in your favor. Plus I think #1 kind of reads like a fortune cookie - the lesson is live life to the fullest. Though I guess you could use your experiences to show how you'd get involved at school and how you'd help make an impact.
I think you could get more out of #2, you could talk about having to rebuild that relationship, regain trust, how you accomplished those things, etc.
I think you could write a good essay on #1, it just didn't sound quite like the right one to me.
I haven't even started applying yet though, so take it with a grain of salt...
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"Egotism is the anesthetic that dulls the pain of stupidity." - Frank Leahy