To dream that you are on vacation indicates that you need a break to recharge your energies and revitalize yourself. You need to break out of your daily routine and do something different. Alternatively, dreaming of a vacation represents your achievements. You are giving yourself a pat on the back and are deserving of a reward for your hard work. 

To dream that you are having a bad or awful vacation suggests that you are not able to escape from the daily responsibilities of your waking life. You are having difficulties coping with life’s problems and issues.