When you dream or have a vision about an island, this tells you about the feeling of ease and relaxation. Often times this is something you have longed for and have now finally found. Another explanation is that you experience loneliness but you also feel limited and limited in your possibilities.
If you dream or have a vision that you are stranded on an island, this tells you that you are caught in the rut and do not know exactly what you want in your life. On the other hand, you could be looking for stability. You may turn away from a situation rather than confront it in your life.