To dream that you have a suntan, signifies the shadow aspect of yourself. It represents your primal instincts and natural senses.
A pleasurable dream of lying in the warm sun is very fortunate, signifying happiness and good friendships.
To dream of having tan lines suggests that you may have made some errors in judgement which you are feeling guilty about - or that you’re afraid of being caught over. Also see “Tanning Bed.”... My Dream Interpretation