Bob, a fisherman, takes one vitamin B-1 tablet a day April through October . He said it works. He was right. The odour the tablet gives out through your skin (you can not smell it) repels mosquitoes, black flies, and knat's. It does not work on stinging insects.He hasn't had a mosquito bite in 33 years. Try it. Every one he has talked into trying it works on them. Vitamin B-1( Thiamin Hydrochloride 100 mg.)

NPR reports that if you eat bananas, the mosquitoes like you, something about the banana oil as your body processes it. Stop eating bananas for the summer and the mosquitoes will be much less interested.

This is going to floor you, but one of the best insect repellents someone found (who is in the woods every day), is Vick's Vaporub.

Plant marigolds around the yard, the flowers give off a smell that bugs do not like, so plant some in that garden also to help ward off bugs without using insecticides.

One of the best natural insect repellants is made from the clear real vanilla (not the grocery store vanilla extract which is mostly alcohol).  This is the pure vanilla that is sold in Mexico or the Dominican Republic. It's cheap there if you know of someone that lives there or in the US close to the border. If not, health food stores usually carry it or can order it for you.
Use half vanilla and half water, it works great for mosquitoes and ticks.

"Tough guy" Marines who spend a great deal of time "camping out" say that the very best mosquito repellant you can use is Avon Skin-So-Soft bath
oil mixed about half and half with alcohol.

Or mix your own:

20 drops Eucalyptus oil
20 drops Cedarwood oil
10 drops Tea Tree oil
10 drops Geranium oil
2 oz. carrier oil ( such as Jojoba )

Fight West Nile... pass this along to all your friends in skeeter land!!!

Natural earwig repellant - 3 parts soy sauce, 1 part oil, well mixed and placed in a shallow container where you know them to be.  Neither toxic nor harmful in any manner to other creatures.