Best way to combat mosquitos

While we are solidly snowed in here in Rhode Island, we cant stop thinking about summer and RVing! We are already thinking about getting ready.
What have you found to be the best way to combat mosquito and pesky bugs around the campsite? Sprays, zappers, lanterns? Are there any reasonably priced screen rooms that attach to an awning, and if so, are they worth getting?
Thanks for all of your experienced opinions.