Maintain multiple independent identities. Exercise and make friends with people who do your preferred activity. If you have a startup or a high profile job, blog or tweet as your own persona about topics that do not fall under your line of work, but are still interesting to you. Keep up friendships and dating and when you talk about work, only do so when it is a good story. Socialize with people that live differently…
As a student I had a moment when I decided that the standard geek "identity package" of things one was supposed to like and do was ... limiting, and that it would be better to have a wider set of interests.