DEET or Picaridin for maximum protection.

PMD from lemon eucalyptus (Corymbia citriodora) extract is reportedly very effective. Check concentrations.

Some folks say Picaridin and PMD are more pleasant to use than DEET.

Permethrin is primarily useful for applying to clothing and other materials. It's applied directly to the skin only to kill scabies, chiggers, etc.

The original Avon Skin So Soft had an unwarranted reputation for being an effective insect repellent that was exaggerated over time. Local outdoor theaters and entertainment venues provide it because it's safe, harmless and pretty much useless. But people believe it works and if they don't get bitten the illusion is reinforced. In fact they may have been bitten by mosquitoes but if they take effective antihistamines for allergies they'd probably never notice any reaction anyway. That doesn't mean they didn't get bitten or that the mosquito didn't transmit disease.

Avon now makes a version of Skin So Soft with Picaridin, which is reportedly moderately effective when applied carefully and renewed every hour or so.

I usually carry small bottles or Mylar packets of combined sun screen and effective insect repellent. Makes it easier to get it all done at once. Seems to be effective too. I usually choose the sunscreens that contain DEET but this year I may try the Picaridin or eucalyptus derivative just out of curiosity.