Are you sailing? Aegina has all the requirements you are looking for. It is located at very short distance from Piraeus and by using it as a base you have the chance to visit many small and large islands, from the most popular to the uninhabited ones.
Particularly during summer afternoons the favorite among sailors, pleasing S-SW wind is blowing and this is another reason why this island is preferred by those sailing.
Now, if you do not have a yacht, at the marina of the city you can find sailboats and boats which offer tours. And if you still feel jealous and want to learn how to do it yourself, the Sailing Club of Aegina – which boasts distinctions on a national and international level – runs sailing courses for children and adults.
Trim your sails then!