An island in a dream often represents a chosen or unchosen distance from other people -- a need for independence, or a loneliness that's crept in without you fully noticing. A peaceful island can reflect welcome refuge, while one that feels stranding suggests the isolation has gone further than you actually wanted.
Planets are notably made unfortunate by these accidents, viz. Combustion, Retrogradation, Peregrination, Detriment and Fall. - William Lilly (1602.-1681.)