You have 2 main options for the skin:
Citronella - this is a natural product, essential oil from lemon grass, it's the stuff in the Avon Skin-So-Soft. It's friendly to the skin.
Deet (diethyltoluamide) - This is the active ingredient in Jungle Formula. It's horrible stuff, melts plastic, dyes clothes, dries your skin out. Last resort imo.
Then you have you mozzie coils which use the extract from flowers, nice and natural.
There are some newer skin friendly options such as Incognito - I tried this and it didn't work for me but lots of guys swear by it. 100% natural.