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 .
Ankle swelling can also be due to pregnancy, being overweight, vascular problems, or orthopedic conditions, such as a bone fracture or a sprained ankle. Swollen ankles can also indicate a potentially serious disorder, such as congestive heart failure, deep vein thrombosis, and liver failure. Because ankle swelling can indicate a potentially life-threatening illness, you should seek prompt medical care and talk with your medical professional about your symptoms.