5 Star Accomidation In Bangkok and Pattaya?

hi..im planning to go to bangkok and pattaya in september month end..i checked various websites and got to know abt the accomidation there..i wanna stay in a 5-star hotel for 1 day coz i found its less expensive compared to india..could any 1 who had been there before help me in providing the correct info...i would be happy if i get a good five star hotel for around 3-4k INR.