I've tried a bunch of so called natural insect repellants and if they are as bad as you say your going to need deet. I use it sparingly and only spray it on my clothes, allow it to dry, then put on the shirt and gloves, other then that I suggest a bugtamer. I have 5 bugtamers, I use them when bowhunting, If I didn't have a bugtamer at bow season I wouldn't go in the woods. They are not cheap and I only use the jacket. Mil spec BDU pants that are ripstop nylon are great. Mosquitos can not get through them unles they are heavily worn.
Mosquitos are beginning to get credit for more health risks every year. This year it's equine encephalitis. last year it was west nile virus and your starting to hear about malaria again. You need to take precautions if your are going to be where they are. Don't forget about your pets too.