Been a few times at Easter with teens.
It is hot and expensive but also safe and clean.
Plenty of stuff to do;
Desert safari or quad biking
Burj Khalifa and fountains
Amazing waterparks
Plenty of water sports (powered and non-powered)
There's a great water assault course (think it's called aqua fun) at Jumeirah Beach
Legoland / Bollywood Park
Everything is fairly spread out and nobody walks anywhere, it's all taxis but theyre fairly cheap.
Depends on how adventurous the kids are really.
Alternatively Abu Dhabi is a bit like dubai-lite, not quite so OTT but same weather, safe and clean etc and still with loads to do at Yas Island (waterpark, ferrari world, Warner bros Park etc) and everything is not quite so expensive.