Good exercises to make my belly flat? (quick?)

Okay, so there's this huuuge beachparty here on the island that I live on December 5th. (Because december 5th is Sinterklaas-it's a Dutch Holiday) Like,seriously,a Miami-beach party ish. Theres going to be cameras everywhere filming it (for 2 tv-shows:...

one here in Curacao, and the other one in Holland!), there are going to be performances, beachvollybal-tournaments,Miss Mambo (the name of the beach is Mambo Beach), special guest-stars..

So the thing is, normally I always wear a boardshort and a tankini, because I hate my belly. Its not really FAT-its just like, kinda sticking out and saggy and blah. It looks blah. But for that party I really want to wear a normal bikini. I'll look so stupid there covered in clothes from the knees to the shoulders. So what exercise can I do that will make my belly shrink really fast? What are good exercises? How many minutes a day? How much, how long, etc? Does anyone know?

sit-ups are realy good do as many as you can for about and hour

and just normal excersises realy just for aslong as you can

You should look it up on you tube they have a lot of at home routines you could do and they relaly work **if you actually do them*
I personally do this.
Stationary running 30 Seconds
Jumping clap 25 Reps
Mountain CLimbers 25 counting right foot only
Cross country Skier 25 Counting right foot olny
Burpees 25 reps --- these are so good (hard but good)
Shadow boxing 25 counting right arm only
Shadow Kickboxing 25 counting roght foot only
Keep in mind that these are all at the fastest pace you can go it works really good the kickboxing one hurst you abs if you twist you abs look it up ts great. !!!