Hi! - Hope they like big waves because there's usually plenty of them but don't worry, if they're not into waves, there's a calmer beach just down the road.
There's also a water park just up the road (not really walking distance).
Temps' usually in the low 80's in the day and the high 60's at night. Evenings you might want a cardi'.
Check out my Lanzarote website for info' other sites don't tell you:
http://www.pinetreecottage.freeserve.co.uk