If you have never been, you need to visit the temple of the emerald Buddha and in general on the territory of the royal palace and look at the national museum nearby. But personally I like Wat Saket (the temple of the golden mountain) and the view from the mountain itself Another very cool Wat Arun, especially its amazing pagoda, is worth a visit. In principle, there are still many temples, you will get to some on the way, for example, if you get to Asiatique. Which I strongly advise you to do. Firstly, in one direction from or to the BTS Saphan Taksin station, you can swim both on a free river tram from Asiatique, and on a longtail or a pleasure boat, I strongly advise you to do it at sunset, the view of Chaopraye is gorgeous. Secondly, on the way, if you walk from the station to Asiatique, there are several nice temples. Finally, in Asiatique, you can eat in an atmospheric seafood restaurant, buy some clothes, eat cool ice cream, walk along a great embankment, even ride a Ferris wheel. From the parks, of course, I advise you to Lumpini, since it is in the center, you can take a walk somewhere along the road. In the evening, you can visit Khao San Road, a shopping street - the eternal nightmarket. If you want an observation deck, first of all, you can visit the Sky Bike - there is a good overview on the 83rd floor It's better not to go very early, but in the morning, while there are no crowds. Secondly, the skywalk is an observation deck with a glass floor in King Power Mahanakhon. Of the interesting things, the Jim Thompson House Museum is architecturally beautiful and the exposition is entertaining. The Erawan Museum is interesting - a giant three-headed elephant is still cool inside, but it's a bit far from the center. You can visit Sea Life Bangkok - aquarium, I love it very much. In the Lumpini Park area, it's good to go to the rooftop bar in the evening/overnight. If you like parks, then you should go to Suan Luang Rama IX Park - it occupies 80 hectares and there are themed zopnas in Chinese, Japanese and European style. The third favorite park is Chatuchak, it has two other small neighboring parks, you can also take a great walk. Well, Chatuchak as a market is also interesting, it seems to be the largest in Southeast Asia.. If you stay longer, it makes sense to roll down to the floating markets, on the same Bang Luang.
Another very cool Wat Arun, especially its amazing pagoda, is worth a visit. In principle, there are still many temples, you will get to some on the way, for example, if you get to Asiatique. Which I strongly advise you to do. Firstly, in one direction from or to the BTS Saphan Taksin station, you can swim both on a free river tram from Asiatique, and on a longtail or a pleasure boat, I strongly advise you to do it at sunset, the view of Chaopraye is gorgeous. Secondly, on the way, if you walk from the station to Asiatique, there are several nice temples. Finally, in Asiatique, you can eat in an atmospheric seafood restaurant, buy some clothes, eat cool ice cream, walk along a great embankment, even ride a Ferris wheel. From the parks, of course, I advise you to Lumpini, since it is in the center, you can take a walk somewhere along the road. In the evening, you can visit Khao San Road, a shopping street - the eternal nightmarket. If you want an observation deck, first of all, you can visit the Sky Bike - there is a good overview on the 83rd floor