You can learn a lot about the field of health from going on a tour of a medical facility. Check to see if Kluaynamthai Hospital is open to the public while you're in town.
When you've finished up at this health care institution in Sukhumvit, why not check out Siam Paragon Mall, Pratunam Market, and MBK Center? They're close to Kluaynamthai Hospital and also popular with tourists.