There is nothing worse than a beautiful summer night ruined by vicious mosquitos. Well, why I didn't know about this sooner is beyond me, but this Thermacell Mosquito Repeller literally creates a 15 foot zone of protection against mosquitos so you can sit outside in peace without having to douse yourself in bug spray or burn citronella candles. It is easy to use and scent free and heat activated by a cartridge that you can refill.
Linked here.