http://wwwn.cdc.gov/travel/contentDe...bTropical.aspx

Use insect repellent containing DEET or Picaridin. DEET concentrations of 30% to 50% are effective for several hours. Picaridin, available in 7% and 15% concentrations, needs to be applied more frequently. (Note: apply any needed sunscreen before applying insect repellent)
It may be useful to spray insecticide indoors where the Aedes mosquito like to linger, e.g. closets, behind curtains, under the bed, etc.
Wear lightweight long pants and long-sleeved shirts when outdoors
Stay in hotels or resorts that are air conditioned. If air conditioning is not available, staying in well-screened rooms can reduce contact with mosquitoes
Empty or cover containers that can collect water (e.g., uncovered barrels, flower vases, or cisterns), because mosquitoes that transmit dengue breed in standing water