The Skytrain (BTS) has two lines running above Bangkok's central areas, while the Bangkok Metro has one route and covers areas not connected by the Skytrain. The Metro intersects with the Skytrain at three points and has 35 stations, with frequent services running until midnight. The bus system has always been the main form of public transport, but it should be used with care due to pickpockets.
The most interesting way to get around is on the waterways of the Chao Phraya River where numerous river taxis, long-tail boats and large waterbuses make most tourist sites easily reachable. Tuk tuks (colourful three-wheelers) are the standard way of making short journeys by road and are cheaper and quicker than regular taxis, but fares should be negotiated before boarding. Metered and un-metered taxis are air-conditioned, but be aware that drivers don't carry much change. Any taxi or tuk tuk can be hired for a day's tour of the sights.
Bangkok also has free bikes for tourists for two set routes along the river; the east side goes past some of the biggest temples, while the west side goes through more residential areas.