Acquire a spray bottle and fill it with water. Then add about 5-8 drops of Lavender and spray it all over you, especially around your legs, boots and head. You can also do this with Peppermint or a combination of the two. My brother is out in the yard all of the time and he says there is a big difference when he uses it.
Lavender is really good for alot of skin problems, like plant stings and burns (including sunburns).