Chao Phraya Express boats system is one Bangkok's transportation options. With it you can discover the city from another angle, the river side. It is disorienting even if tours on the khlongs (small channels), we strongly recommend, are more impressive. Tickets can be purchased directly on board to the attendant who shakes the small metal cylinder containing its money to get your attention. Single price of 15 baht on the orange line (regardless of destination), the most standard and 35 baht for longer trips (Green Flag Boats that circulate during the week and go to Pak Kret close to Koh Kret island). The crowd is important, especially at major Bangkok tourist attractions stops, you may have difficulties to find a seat.
Most important stops are Sathorn connected with BTS (Skytrain) and Ta Tien close to Wat Pho and Chang Ta close to Bangkok Grand Palace. Choose to arrive to these monuments by the river provides an interesting overview before visiting them in detail and also eanbles to discover Wat Arun , on shore, opposite to Wat Pho
Chao Phraya Express is connected toBangkok BTS skytrain at Saphan Taksin station.
The Bangkok Skytrain is called BTS. The trains have air condition and let you go over the heavy road traffic in the capital but you can not go everywhere even if connected to the Chao Phraya Express baots, it can let you go to major temples in Bangkok.
Bangkok subway is called MRT. The metro line only covers a small part of the city even if connected to the BTS it offers more opportunities. The MRT is veru clean, has air conditioned cars and is especially convenient to get to Hua Lamphong station.
Taking the bus to get around is clearly not the easiest mean of transportation to use for a foreign tourist in Bangkok neither the fastest one but it's the cheapest one. Bangkok bus network is wide and you can go almost anywhere but just need to be patient.
Only Thai city for the moment to have a metro (there is metro project in Phuket), Bangkok is the city in Thailand that offers more choices of public or individual transport (metro, bus, boats, tuktuks...). No, there are not just tuk-tuks and pink taxis to get around Bangkok !