I saw this thread yesterday, but wasn't sure which experience to pick lol. I have several great life experiences, but all different kinds. It's a choice between....:
Being at the Taj Mahal at sunset and feeling SO peaceful... I can't really describe how I felt, but it was wonderful.
Swimming with dolphins was also pretty amazing and something I'll never forget.
I rate my University graduation at the top of my life experiences too.. I went through a very tough time at university.. and to come out 4 years later with excellent grades, was a real achievement