Mosquitos do not bother me (I get maybe one bite a year) but they eat my niece alive so when I took her to Disney last summer, I took bug spray, her OFF repellant fan, a ton of refills for the fan and Benadryl cream for any bites she might get. It was all in my checked luggage so we did not use it on arrival day and she did not get bitten so we decided not to use it the other days, either. She ended up with zero bites for the week. I don't know how Disney does it but we had absolutely no troubles so if I were in your shoes, I would not be very concerned. I have no plans to take bug spray this summer based on our experience last year.