I think this is a big question and the answer, in my case, is changing very often. I don't like to plan things in long term, of course I have some goals and dreams I want to achieve (perhaps in long term). But sometimes I resign or postpone some dreams for later on, or I simply change my mind on them and replace them with some new dreams.
We are free to dream, and we are free to reach or not each dream, it just depends on us. But, what I think it is also very important is the value we put on each of them. I mean I should make a balance with priorities, necesities and whishes... That is why I should carefully know what is what I want, and reflect on that. And then the answer comes to my mind and seems so simple and easy: LIVE A GOOD LIFE.
But, in fact it's not so easy. Some people seem to be dead on life, they have no goals, no aims, no hope, no nothing... They are dead, because they think that anyway they are going to die... Let me tell you something nobody can scape from that (not yet - and not taking into account religion) but at least we can make our lives and the lives of the ones around us a little better, pleasant, etc.
"I am not afraid of death, I just don't want to be there when it happens."
"La vida puede no ser la fiesta que esperamos, pero mientras estemos aquí, ¡deberíamos bailar!"