Both sentences make perfect sense, they just have very slight differences in meaning. The difference is so miniature that it’s almost not worth mentioning. But I’ll explain it to you below. The first sentence suggests that the students have an opportunity to eat and play. Saying “get to” is the same as saying “have a chance to” or “have an opportunity to.” The second sentence simply states that the students eat and play at recess and that is exactly what they do. In essence, both sentences have very similar meaning and could most likely be used interchangeably. Hope this helps!