i wouldn't be in Greece at this time of year, it's usually unbearable, you can find shade, but it means spending a fair bit of time in it. Go slightly later in the year and its very nice. As to now, don't know, outside in the garden with a cool breeze and a cold beer
I sometimes use the outdoor pool in Gourock, Scotland beside the River Clyde.
It also has a gym.
They also open the pool late at nights for a 'Midnight Swim' under the stars.
Great fun because the pool is heated.