From the Airport Thai International have a limousine service which will take you anywhere in Bangkok, and a mini bus service to major hotels. The booking desk is located in the arrivals hall. Ordinary taxis can be booked near the front exit. Getting around Bangkok can be a confusing city to navigate so get yourself a good map, preferably one marked with bus routes. Air-conditioned buses, which have major destinations marked in English, are an economical way to travel.
Ordinary buses are cheaper still, and much more frequent, but can get quite crowded.
Central Bangkok also has a micro bus service. Probably the most convenient way for the visitor to travel is by air-conditioned taxi, most of which have meters. Fares are quite reasonable even for long journeys. Three wheeled taxis, which are called Tuk Tuks, are a familiar site on Bangkok streets. The ride can be a little hair raising but is generally safe, be prepared to bargain for the fare.