Man! That would be fun. I've caught them before, as bycatch, while fishing for other species. They, and freshwater drum, are like hooking a John Deere. Snagged one this fall, in the dorsal fin in the current, and it took me 10 minutes to land it. I can't imagine the tussle on light gear. And as said above, there should be pike in the same waters, as well as gar. As a matter of fact, I saw a pretty good sized gar this fall too, after dark.
Diaper bay, early in the morning, would be like glass. You should be able to easily see what's going on, and I have to think it's be a couple three guys giggling like girls, jumping around Dane's boat.
Alternately, just slowly carefully walking around in a foot of water should get the job done too.
I once hooked a LARGE carp in the slack water on the west side of the wingwalls (Garrison Dam tailrace) on a piece of imitation crabmeat from my sammich. That was a half hour well spent. Also, same area, there is a creek by the Downstream Campground that is routinely filled with the big animals.