We love Lanzarote for the sunshine- a big contrast from the UK where we live.
It's an easy flight due south- about 4 hours, so no jet lag to exhaust you at the beginning or end of the holiday!
There's not much rainfall, and the arid volcanic landscape is very dramatic. There's no high density high rise developments here. The beaches are clean, and the sea front in Puerto del Carmen has been hugely improved in recent years.
There's plenty to do, if you want, but it's mainly a great place to relax. 

For a good overview, please use the link below;

www.lanzaroteguidebook.com