I'm looking for a perfect song to sing tomorrow A.S.A.P. plz!!!?

Hey, well let me just say thank you for choosing my question because I don't get that much people to answer. Tomorrow I'm going to a beach where they have a karaoke night and I'm trying to win a pretty rose and some money there. I'm going to sing 'If I Can Dream' by Elvis Presley. My voice is calm and I make alot of pretty waves. But it can only last for like 10 seconds. So I can't sing 'I Will Always Love You' by Dolly Parton. (My voice didn't last long enough :( ) Or I was thinking 'Imagine' from John Lennon. Are any of these two okay or is there another that might be perfect for me? Thanks 1 million times, good night & God bless. :)