The best thing you can do is travel, and also aim to learn a new language (it'll open up your eyes to how much else is out there). Particularly today, where most cities have co-working spaces with strong communities & community platforms like StartupDigest.com are active around the world with weekly events, it's easier today to travel & work for a few weeks than ever before. Whenever I find myself in a predictable routine as well, I like to attend conferences; I find the energy there is always helpful.