If the shooting platform will be elevated, hang the lights underneath it angling downward.Keep theminside the outer edge of the boat, to keep them from hanging up on brush near the shore, like this...




Lights can also be hung from the railing...




If the platform will be below or even with the top of the gunwales, you'll want to use options discussed in this other thread...
http://www.huntingnet.com/forum/tm.aspx?m=2510887