Yes, vacations are important to anyone no matter what their status or position in life. It is a time to "let down", relax and nourish the soul. It is a break in the routine and monotony of life and are important to anyone in life. It is a time to "recharge the batteries" and get a different perspective on life. It is time to find a release from the stresses of job and life.
As far as Obama and the presidents, it is important for them to get away from Washington DC and all the stresses and strain that goes along with the job. It is time to reconnect with family and friends. Although the presidents are 'on call' at all times during their vacations, it is good for them to relax and enjoy their own country. I don't begrudge any president a vacation and leads to balance in their lives. I don't want an over-stressed, over-worked president making a lesser decision because they are tired and stressed. Balance is important for all people, the president included, in life.
I know we sometimes begrudge the presidents their luxury vacations where money is spent on place, accommodations and security. Yet, doesn't the president deserve this for all the time and 'on call' time he gives to the country? I see nothing wrong with Obama vacationing on Martha's Vineyard. It is not that exotic and only for eight days. One day more than a week. I don't think that is out of the question. If there is a crisis, Obama will be back in DC immediately.
I want a president who is thoughtful, bright, and lives a balanced life. Life in the fishbowl of DC is difficult enough.