A bat box, similar to a bird house, but for bats, is something I'd recommend....a bit jokingly though but I'm still half serious. They love mosquitoes! But then again I'm partial to bats. They freak some people out though. On a more serious note, a trick I learned in survival school is to eat the head of a match. The sulfur enters your bloodstream and acts as a natural mosquito repellent. They may get near you but wont stick their thing into you. But by far the lemon juice is a pretty cool idea.