By metro
Dubai's 52-km long Red Line, opened in September 2009, is the second metro in the Arab world after Cairo. As of May 15, 2010, 21 stations are open and the rest are scheduled to open by the end of the year. While the line does not serve the old city center, it's handy for zipping along Dubai's long coastline and includes stops at the airport, Burj Khalifa and the Mall of the Emirates. The Green Line, which will burrow through the city core, has been pushed back to August 2011. Single tickets range from Dh2-8.50, or double that for use of the "Gold" first class carriage. Train run every 3-5 minutes from 6 AM to 11 PM every day except Friday, when services are limited to 2 PM-midnight. All stations are air-conditioned and there's a large network of feeder buses.
In addition, a 5 km monorail system shuttles passengers across the Palm Jumeirah to the Atlantis hotel, but it's not connected to the metro network and is thus of very limited utility.