Last week, I found some ripe Fox Grapes (Vitis labrusca) in Plainville.
These wild grapes have seeds, which can be chewed and consumed, or alternatively spat out. If you just want strong grape flavor with no chewing or spitting required, simmer the grapes in a little bit of water, mash them up and strain out the skin and seeds. You can use the resulting dark, pungent liquid to make jelly, sauce, or wine, or you can simply drink it straight or thinned with more water.
Preferring a whole fruit experience, I typically just eat them out of hand.