Personally, I would question whether that was my "best" page.
If I sell a widget, and I also have a page on my site about the care and feeding/maintenance of that widget, and all my traffic comes in to read about the maintenance but doesn't buy... then even if it gets the most traffic, it's probably not my best page, because it's not getting traffic targeted to the goal of my site. Actually, it's probably only attracting people who have already bought the widget, either from me or from my competitor.
So you might want to do some thinking about whether that page is really doing you any good on that site. Absolutely try the suggestions above. Take a good look at your analytics, see if the the traffic coming in on the same keywords and from the same referrers and the same locations. If you can't convert that traffic to actually buy your products, can you do anything else with them? Start an email mailing list - "If you're interested in this, sign up now for more information..." A list of your own can be a wonderful thing, specially since it's entirely Google-free. Maybe move the content to a facebook fan page for your business? Or you could even think about adding something to your product line that might appeal to these people.
Lots of things you could try, and if the page isn't converting anyway, you're not risking much.