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 .
Water retention is one of the most common causes of swollen legs, but it usually causes both legs to swell. Sometimes there may be slightly unequal swelling, with one leg being noticeably bigger than the other.