Take a shower. Not to sound sarcastic or anything but I found that if you take a shower with Scent-A-Way shampoo and body wash (the green stuff) the bugs don't bother you too badly. That and scent blocker clothing.
About the only thing that attracts them is your breath. The carbon dioxide you exhale attracts them. So if your scent free (as much as possible) and don't breath you should be ok.