"Carried Away" by The Kooks [this is an awesome song, and I don't think it really matters if you're a dude or a girl] of "Satellite" by Guster. Or "Winter" by The Dodos. "This Is the First Day of My Life" by Bright Eyes. I think these songs are generally easy to sing. But I really wouldn't know because the only time I sing is in the shower [TMI moment for me].
I suggest that your choice suit your style of singing and that it fit your personality and presentation. I don't have song in mind, but have seen too many singers sing songs which honestly, don't complement them. You may love a song or style of song, so be sure it will bring out your best in all ways ... presentation, sound, feeling and overall effect! The right song for you, as well as your audience ... the era of the song combined with your voice and all that makes your presentation whole, will make you proud of yourself and show your best performance! I hope this helps... Good Luck!