There are more than 70+ shopping malls and arcades in Dubai alone. With The Dubai Mall crowned with the world largest mall make it a ‘must see’ tourist spot in Dubai.
Besides few other indoor attraction (fee based) such as Dubai Aquarium & Underwater Zoo, At the Top Burj Khalifa, Ice Rink etc, the music fountain showcase draw huge crowd every evening (because it is free and nice to watch).
Viewing from the restaurant balcony would be a good choice. Do take note that the music and performance varies every 30 minutes.