As an entrepreneur, there never seems to be enough time to do it all ... work, travel, spend time with family, sleep, exercise, eat well, explore your passions ... dare I say just have fun.
As entrepreneurs we get a great deal of enjoyment from our work, but it's important that you leave time for a rich and stimulating life outside of work ... in doing so, you will be healthier, you will be a more effective leader and you will gain both valuable perspective and improve your ability to innovate.
Work hard, yes. But remember that life is a marathon, not a sprint. Take the time to explore and celebrate the other parts of yourself, and your life. Heck, just leave time for fun. You will likely accomplish far more that way.