What do you do with it (them)? Well, that's where this instructable comes into play.
Note: Some of the photos depict some pretty graphic turtle-ness. If you are a card-carrying Sierra Club/PETA member, or just don't want to see some turtle guts pictures right now, then don't look at this instructable.
I'm sick of people leaving comments saying that this is mean. Can you please be concerned about something infinitely more important, like the millions of innocent human beings that die each year?
If you eat meat, especially, realize that the meat you eat was once an animal. The difference between it and these turtles is that (except in the case that someone hunted the animal and gave/sold its meat to you) these turtles, while alive, were free to roam around the lake they lived in and wherever else they chose to go. The animals whose meat you buy in the store were probably kept in ridiculously small pens, fed ridiculously low-quality feed, until they were fat enough to kill profitably.
Caution: Obviously, you'll be dealing with a turtle (quite possibly a mean, old snapper), so be careful around its mouth (esp. if a snapper), and watch the claws. Also, be careful, you're using knives. And scissors, and maybe a bone saw. That bit's up to you.