Museums
Kamthieng House Museum
Ban Kamthieng is a 19th-century ancient Thai stilted teak house where you definitely wouldn't expect it: right in the middle of Bangkok's high-rises. It was transported from Chiang Mai in pieces and assembled in Bangkok in 1964 to function as the headquarters of the Siam Society, an organisation that has the goal of preserving the cultural heritage of Thailand. Beside the house itself, on display are traditional tools, arts and crafts used by Lanna farmers and fishermen from northern Thailand in olden times, as well as a large selection of Thai flora in its yard. There is a heavy focus on the cultural heritage of northern Thailand, as that's where the house and most of the tools on display came from. The only downside of the museum is that it's quite small, so don't expect to spend here longer than 30 minutes or even 15 minutes if you're quick.
National Science Centre for Education
This is an exhibition centre about the variety of scientific knowledge. Among the attractions are a planetarium, an aquarium as well as a permanent exhibition on sports science, communication technology and natural environments. One-hour shows at the planetarium start at 11:00 and at 14:30 with additional shows on Saturdays and Sundays at 10:00 and 13:30.
Museum of Thai Pharmacy
The museum is on the third floor of the Pharmaceutical Association of Thailand under Royal Patronage Building. It was established to publicise about traditional Thai medicine from past to present, so that later generations would learn and treasure it. The exhibition features various topics, such as the birth of pharmacy, the evolution of oriental pharmacy and basic wisdom, the evolution of western Thai pharmacy and the evolution of herbs and natural products. Make contact in advance if you are visiting with a group.
Thailand Creative and Design Center
There couldn't have been a better place for this design gallery, at the the Emporium, the most fashionable shopping mall of Bangkok. The TCDC, as abbreviation-loving Bangkokians call it, seeks to show and promote Thailand's design innovations. There is a permanent exhibition about the question what design actually is, and how it is influenced by factors like society, history, politics, economics, geography and religion. There is also a temporary exhibition that often changes. If you want to enter the resource centre and the library, you can get a free one-day pass. You can only do this once and you must carry your passport with you. Spend the day reading amazing design books, or just using the internet. If you want to visit the resource centre and library again later, you'll need to pay for a subscription.
Benjakiti Park
When the Thailand Tobacco Monopoly moved all its factory operations to Chiang Rai in 2008, the lake and some adjoining land that were part of its compound, previously enjoying semi-wild vegetation, were turned into a public park. Many splendid old rain trees were cut down in order to landscape the park, in which young trees were planted instead. Adjoining the Queen Sirikit National Convention Centre, it is a neat park with dedicated cycling and walking paths, fixed exercise equipment and several monuments.