Las Palmas is a nice city with a fantastic weather even in winter, 22º average. Apart from the city beach, Las Canteras, I also recommend to visit Vegueta, the "old city" and enjoy its lively nightlife.
Weather doesn't look as if its going to behave. I am not too bothered if the temperature isn't normal but I don't want to freeze to death watching the marathon! Our apartment is duplex so we have a rooftop area as well as a balcony. Would like to be able to use them! To top it off, it looks like there is a good chance we fly out when the bad weather is supposed to hit here. I am keeping my fingers crossed!