One thing is certain when you are in Bangkok, no matter where you go, you will find some form of statue or temple that has been built out of devotion to the Buddhist religion that is largely practised in this nation.
A temple that is well known amongst travellers is the Wat Saket which is also known as Golden Mount. It is found within close vicinity to the Khao San Area and allows visitors a stunning view of the city below.
Additionally, there are many other temples in Bangkok, such as the Wat Pho, Wat Arun as well as the Grand Palace. The best way to approach this would be to simply pick one or two temples at most to visit during your stay so that you can still enjoy the unique cultural underpinnings and ambience without being worn out.
If you are staying at 5 star hotel in Bangkok such as the Pathumwan Princess Hotel, be sure to discuss with the staff how to organize a tuk-tuk for your travels to these temples.