More people go out in the day than they do in the night.
人が外出してる時間は夜より昼の方が多い - There are more people out and about in the day than there are at night. もしくは More people go out in the day than they do in the night.
この場合は out and about = あちこち(出歩く、出かける、外出する)
go out - 出かける、外出する
More people go out in the day than they do at night や More people go out in the day than the night. も大丈夫です。