How do i look better in a bikini?

alright so im not really a fat person. But my stomach doesnt necessarily look the best in a bikini. Like what can i do, thats realistic and doesnt take a long time, to look more toned? im going to the beach in a week and a half and i'd like to look a little better because all the other girls are really skinny. Also im thinking like longish term since summer has just begun. Thanks:)