Well, if you are going to stay in Bangkok, one of the very nice places to visit would be the Jim Thompson house. You can get there very easily on BTS, you simply ride it to Siam square, then take the next line to National Stadium. From there, it's easy to follow the signs and walk to the Jim Thompson house. When you are walking toward the Jim Thompson house you will pass souvenir shops. Now these shops are very reasonable and you will enjoy bargaining. In fact, if you simply look at something long enough the price will come down.

However, if you go to the Jim Thompson house and you try to buy souvenirs there you will pay through the nose. However, it is inexpensive to visit the houses. And it is very interesting because they have good English-speaking guides that tell you all about the development of Thai silk which Mr. Jim Thompson was responsible for. This is probably one of the most delightful trips you can take while in Bangkok.