Bureau of the Royal Household

This is an administrative office, not an attraction, and it helps to know that before you go looking for it. The Bureau handles the affairs of the Thai Royal Family and sits inside the Grand Palace complex on Na Phra Lan Road, which is why most people who mention it were really there for Wat Phra Kaew and wandered a little further along.

That wandering is the point, though. The stretches around the palace walls are quieter than the temple courtyards, and reviewers keep coming back to the same thing, that late afternoon and early evening out here is genuinely pleasant, good for a slow walk or a jog once the heat drops. If you've done the temple and your feet still work, keep going rather than heading straight for a taxi. Just be aware you're sharing the road with traffic, and there's not much sidewalk to hide on in places.