I don't wear anything while cycling because I don't slow down enough for bugs to hit.

But for most other things--things from picnics to camping to fishing to outdoor concerts--I use a Thermacell.

It's a butane-fueled warming plate upon which you put a small synthetic pad of some type of insecticide (a synthetic pyrethrin, I think).

The butane cartridge lasts about 8 hours; the insecticide pad about 4. You can buy them at WalMart, camping & sporting goods stores. I also bought a little holster for mine.

There is nothing on your skin and almost no detectible odor. It repels mosquitoes and midges/no-see-ums for about 300 or so square feet. I generally place mine upwind of me.

I spend lots and lots of time sitting outdoors in a stationary position for hours. I would go nekkid in the deepest jungles with it; it's that good.

The rub when traveling is getting the replacement butane cylinders. I go to some remote areas where there is no store and you can't (legally) travel by commericial air with little tankies of butane, though I've gotten away with it before. I suppose you could mail some ahead of yourself.

Uh, and no farting around it