When you arrived in Suvarnabhumi Airport (BKK), change your money to Thailand Currency - Thai Baht - THB. In these days is exchange rate about 322 THB for 10 USD and 445 THB for 10 EUR. I was surprised when I realized, that all banks in Airport have a same exchange rate ;o)
Take the BTS train to Phaya Thai Station - it’s last stop of BTS Express line or City line from Suvarnabhumi Airport. Departs Phaya Thai (BTS) station and Bangkok Airport every 12-20 minutes. The journey takes about 30 minutes. The City Line runs from 06:00 AM to midnight every day. City Line fares are about 45 THB. When you go to the street under Phaya Thai Station you can stop the taxi and go to Khao San Road. It tooks about 45-50 minutes in traffic jam. This route cost usually about 100 THB. Khao San Road is strategic point in Bangkok if you want make sightseeing in old town. Don Muang Airport (DMK) !!! Air Asia and other airlines has a new terminal in Bangkok since 10/2012 - Don Muang Airport (DMK) - this terminal is on the other side of town - and it’s really little bit far from Suvarnabhumi Airport (BKK). http://en.wikipedia.org/wiki/Thai_baht http://en.wikipedia.org/wiki/Suvarnabhumi_Airport http://en.wikipedia.org/wiki/Don_Muang_Airport http://www.donmuangairportonline.com/ http://www.bts.co.th/customer/en/02-route-area.aspx http://www.bangkokmetro.co.th/?Lang=En http://www.bangkokmetro.co.th/map.aspx?Menu=8&Lang=En http://en.wikipedia.org/wiki/Phaya_Thai_Station
http://en.wikipedia.org/wiki/Khaosan_Road