Here are the Honda instructions for the accessory harness. Ignore the part about the 12 volt frunk outlet. Once you have the accessory harness and relay installed, you have four switched and fused connections available for light duty accessories. It's tidy and doesn't cost much.
http://powersports.honda.com/documentum/MW01/08V71-MGS-A30.pdf
http://powersports.honda.com/documentum/MW01/08V71-MGS-A30.pdf