You could spend the day exploring the near by markets like Indra Square, where you can find lots of Indian food options. stuffs sold here are very very humbly priced, humble enough to have your jaws dropping. I had the cheapest and the best foot massage of my life done here and I am still not over it.
On the second day I visited the Grand Palace. The most enjoyable route is to take the BTS Skytrain to Taksin Station and then take a Chao Phraya River Express boat to Tha Chang Wang Luang Pier. A short walk from the pier to the entrance to The Grand Palace public entrance and you are there. The tickets entry tickets are currently priced at ₹ 2,313. You can have a glimpse of the palace in the video above. Make sure to carry your scarves and hats to keep from the scotching heat.