Depends on your nationality. In general, all GCC residents with a valid RP and a professional qualification can get a 30 days tourist/business visa (Visa on arrival)at DXB airport. If you are an american, you can get a 30 days visa even if you are not a GCC resident. Contact UAE embassy in Doha before u plan ur journey. Visit WWW.MOI.GOV.AE. Goodluck