We hear that expression a lot, but what does it really mean?

Enjoy the little things
To me, it's not the big exciting adventures, it's making the most of all experiences, daily. Yes, you can travel the world, but for most of us, that's only a tiny percent of the time. So the trick is making the most of ALL of the time. The time spent at work, the time spent at home, the time spent doing the dull tasks.
The secret to happiness is making the most of as many moments as you can.
Always chase your dreams, and do what you enjoy but also treasure those around you who bring you happiness.
Celebrate the sunny day and the flowers, see the beauty in the mundane. You can travel the globe but not really see it. Start to notice the little things that bring you joy. Even a walk down the street can lift your spirits if you take the time to really look at your surroundings.
Think hard about what you want to see and do, and set about making them happen. The real secret to happiness is its achievability. Always remember there is no weighted value on what makes you happy. Happiness is a state. If going to Paris makes you happy, and laughing with friends at a movie makes you happy, we only intellectualise one as more important than the other. The actual feeling of happiness is the same. That is the lesson often missed.
So don't taint your experiences by wishing for more, focus on the joy of the moment, no matter how big or small.

Celebrate the beauty of the world