Nice free beach with many facilities. The water probably won't cool you down much, though!
Apart from swimming and sunbathing you can also observe how the second palm-shaped complex of artificial islands, The Palm Jebel Ali, is built. Some find it very interesting, but somebody might be annoyed with such a view.
Address (Unnamed Road), Marsa Dubai, United Arab Emirates
Coordinates 25°4'35.273" N 55°7'50.301" E