Help: Ripe Grapevine in my backyard

We rented a home with a 30-ft grapevine in the backyard. Doing absolutely nothing, it is now FULL. The clusters have dark purple skins, very firm flesh, lots of seeds, and the smell/flavor is incredible! It's like fake-grape-juice sweetness.

We both work a lot, and I have part of today to save them. Can come back to the project in about 6 weeks. Can I freeze the whole berries? Or should I cook down & freeze the juice? What's the best way to cook them?