If you find yourself in Istanbul on a rainy day, I highly suggest going to Buyuk Ada or any of the other Prince's Islands. On a sunny summer day, the crowds of tourists are thick and the heat can be overbearing. This is ideal if you want to sunbathe on one of the many beaches on Buyuk Ada. Cloudy days are near perfect on the island as lines for horse carriages are shorter and bike rides up the hill are a bit easier. The ominous sights of dark clouds provide a beautiful backdrop for the historical mansions. If the rain comes, pull up a chair at one of the many sea side restaurants, like Alibaba, drink beer or sip tea and watch the waves crash against the rocks.