Waw only nice comments... Uff!
Well it depends on what u like to do!
You can go swimming, skydiving, jetskiing...
Climbing moutains, go to the desert.
Gather with some friends & do a BBQ in Fujairah!
Chill in a lounge, try some new restaurants (plenty in Dubai!)
Harass girls in malls haha joke.
Hope u'll have a good time!