My sister and I took the train from Amsterdam to Brussels on a day trip back in October last year. The train ride was not too bad. It took us 2 hours and 45 minutes to get to Brussels Central Station. There is no need to take the Thalys, because the duration is more or less the same with the regular international train. There are just less stops, when you take the Thalys, but traveling with the high speed train is more expensive and it requires seat reservations. And the Thalys does not stop at Brussels Central Station, although you can always take the subway to get to the Central Station.
Though Belgium is our neighbor, this was my first time visiting Brussels. We could not have picked a worse date for visiting Brussels. The weather was not very good. It was drizzling in Amsterdam. Well, I thought it was not going to be any rain in Brussels though. Haha. Our first stop was the Grand-Place (or Grote Markt in Dutch/Flemish or Market Square in English). Luckily, every street name in Brussels is in French and Dutch/Flemish. At Grand-Place you can find the Tourist Information Center on the ground floor of the Town Hall.

Town Hall (Hôtel de Ville).
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