My recommendation, assuming Santorini and Mykonos are on the top of your list is splitting 7 days between the two islands. You will want 2 or 3 nights in Athens to see the Acropolis and because you will most likely have to spend your first and last nights in the city.
Answer: Red, swollen legs may be a sign of a circulation problem; therefore, it is important to make an appointment with your primary care physician. Most likely what you are experiencing is called edema. Edema is the actual swelling of the ankles and the legs, typically caused by venous hypertension or venous insufficiency. Hypertension and venous insufficiency is usually caused by one of the following factors: An obstruction or blockage in the veins, which can come from a tumor, or a deep vein thrombus .
An abnormal buildup of fluid in tissues called edema is what causes swelling in the legs. In some cases, edema that results in painful swollen legs and ankles can be caused by lymphatic dysfunction. In other cases, edema can result from long-standing venous reflux, a venous disease that causes spider veins and varicose veins and can lead to more serious conditions, such as skin discoloration or venous ulcers.