This is such a top idea, preventing regrets and having a whale of a time in the process. Suggest you should all have a go! (Really don't know how to tag people).
1. Climb a volcano
2. Visit at least one country in each continuant
3. Get a tattoo
4. Say "I love you" and mean it (cheesy I know, but thought I'd keep it real)
5. Pull an all nighter (actually not going to bed for 48 hours, I always end up snoozing mid-day).
7. Air balloon riding
8. Attend a wedding
9. Attend a premier
10. Learn to play the guitar.
to be continued...