Accessory by pass switch

I want to wire a switch that can by pass the accessory position on the ignition. Basic idea is to be able to hit a switch while camping or what not and have lights and power without digging out my keys. I know there is a few different ways to do this, but I was wondering the best place to splice into the accessory circuit or if somebody does not already have a plug and play kit for this. I know it will be easy to do once I know where to cut.