There are many non-prescription creams, sprays and other chemical based products you can use on your own skin, or around your camp or garden, to avoid mosquito bites. Two such products are Citronella or Deet. As with any product, their effectiveness depends on the situation, your own skin chemistry, and the exact type of mosquito you are dealing with. DeetAvoid areas prone to mosquito infestations. Mosquito's are often attracted to water, especially standing water.
Invest in an electric hanging mosquito "zapper". Many varieties are available in your local well stocked hardware store (WSHS), or look on line. They may even have a USB one by now.
Some people claim that orange peel will drive mosquitoes away. It works for cats, so it may be worth a try if you have no other solution.
Sleep with a mosquito net over your bed, but check for holes regularly.