Hoan Kiem Lake in the early morning

This is the heart of Vietnam, so it's not much of a secret. But the 5am exercise and dance crowd is. To beat the heat, Vietnam gets up early. You can't go for a run at 11am. Too hot. Even in the attached video, it was 28c (83f) by 5am. But from the crowd, you think it was 11 am on a Sunday. Nope. Random weekday. Just after sun-up. If you are braver than me, you can ask the dance troupes if you can join in.