Why should you go there and how do you do it right?

You can't go inside, so adjust your expectations accordingly. The fortress itself is a white, octagonal tower dating from 1783, part of the original city wall. You can only see it from the small park where it stands. That's all. There's no need to make a special trip through the city for it. However, if you're already on Phra Athit Road, admission is free and it's a pleasant place to linger.

The park itself is a true highlight. Benches by the water catch the gentle breeze of the Chao Phraya, which is particularly pleasant in April. There's a water garden with trees growing directly out of the river, a modern bridge that enhances the view, and almost every day someone is practicing yoga or aerobics on the grass while an amateur musician plays nearby. Some reviewers mention homeless people sleeping in the park. It's peaceful, and no one disturbs anyone.