I spend a lot of time outdoors in the summer, and because we have a lot of trouble with mosquitoes and ticks in our area, I always make sure to spray on Deep Woods Off before I go out. Deep Woods Off contains 25% Deet, one of the best known insect repellants. I don't know how bad the chemical is for you, but it does work. I can get about four or five hours of protection, before I have to reapply.
I have always used the aerosol, but you can also buy this in a pump spray or towelettes. The scent is not offensive, but it doesn't have a fresh scent either.
In addition to mosquitoes, this also will repel ticks, black flies, sand flies, chiggers, fleas, gnats, and no-see-ums.
I enjoy being outdoors a lot more when bugs are not bothering me, and this does the job for me.