I try to cut them down every year, but man do those things grow fast! And thick vines! Some are as thick as my wrist and grow so high up in the trees there's no way I can reach them. But...I'll find a place for the new ones and keep a good eye on them. Thanks. ;) V.

If the leaves are just 2-4 inches long and tendrils are simple, then V. rotundifolia is indicated. If the leaves are 4-6 inches long, tendrils are branched, and major veins on lower leaf surfaces are moderately to densely pubescent, then V. vulpina might fit. V. riparia is also possible for your plant, but those usually have longer, more slender tips on leaf teeth.

Yes wild grape. Depending on your perspective it is both.

"The muscadine grape is native to the southeastern United States and was the first native grape species to be cultivated in North America. The natural range of muscadine grapes extends from Delaware to central Florida and occurs in all states along the Gulf Coast to east Texas. It also extends northward along the Mississippi River to Missouri. Muscadine grapes will perform well throughout Florida, although performance is poor in calcareous soils or in soils with very poor drainage. Most scientists divide the Vitis genus into two subgenera: Euvitis (the European, Vitis vinifera L. grapes and the American bunch grapes, Vitis labrusca L.) and the Muscadania grapes (muscadine grapes). There are three species within the Muscadania subgenera (Vitis munsoniana, Vitis popenoei and Vitis rotundifolia)."