So it's about whether it's meant seriously or whether it's meant to be fun. Whether it should be world literature or Czech, whether it should be modern poetry or historical. If it doesn't matter, I would choose something neutral and very familiar, but few people actually read. I would recommend Ovid's Transformations or Shakespeare's Sonnets. Or something from Villon. Personally, at this age I recited Robinson Jeffers (Lighthouse in the Storm or The Shepherdess Wandering to April) and it had a pretty hypnotic effect on the girls present, which I later abused several times.