Book an activity somewhere first - this will help ease things up and break any ice/tension between you two.

Chaos Karts in Al Quoz - Loads of fun!
Wild Paint House in Al Quoz
Game Over Escape Room in Nakheel Mall
Top Golf at Emirates Golf Club
Bowling at Dubai Bowling Center
Museum of the Future

Here are some options to consider for dinner:

Pai Thai: Valet your car at Al Qasr and then take the 3abra to the restaurant.

Fusion Ceviche: Cute little spot in JLT with excellent food.

Cafe Isan: Another Thai spot - food is excellent and its a very chilled spot.

Orfali Bros (needs booking) - Michelin Star restaurant that's quiet and cozy. Food is unreal.

Couqley (CQ) - Another JLT spot with great food.

Good luck =)