Russell Davies offers ten activities that will lead to you being more interesting; including Start a blog, Keep a scrapbook, and Read. I believe you can sum them up into one piece of advice: Do something.
Davies compiled the ten activities, believing they will make a person more interesting, based on two assumptions. However I believe the two assumptions themselves are the point that needs to be made:
The way to be interesting is to be interested. You’ve got to find what’s interesting in everything, you’ve got to be good at noticing things, you’ve got to be good at listening. If you find people (and things) interesting, they’ll find you interesting.
Interesting people are good at sharing. You can’t be interested in someone who won’t tell you anything. Being good at sharing is not the same as talking and talking and talking. It means you share your ideas, you let people play with them and you’re good at talking about them without having to talk about yourself.
via Ben Casnocha