Oil leak on inboard oil pan plug

I have a 5.7 Mercruiser engine with the plug/hose design on the bottom of the pan. The problem is that the plug is pissing oil. I assume this is happening where the hose fits onto the plug. My question is how the hell do I get the plug off the pan. I mean it obviously is threaded, but how do you get any sort of wrentch on it? I only have a few inches of clearance between the side of the pan and the upper part of the hull. Any suggestions?