Although I have ticked off a lot of the worlds great sights, thats not really my goals...mine would be
1) Not work for as long as possible...I love taking a year, or even just 6 months off every couple of years in a way a non backpacker couldn't imagine possible.
2) Smile....I love being happy, and when travelling I am often very happy.
3) Meet great people...It is amazing how many wonderful people you meet when travelling. The amount of people who have helped me in various ways for no reason but they wanted to has always made me happy.
4)Learn stuff....I love learning. I hated history in school, but whenever I am in a country I want to know everything about it, and go out of my way to learn it.
5) Understand the world...I realise now it is much more beautiful than I thought it was before I started seeing it.