Is Goblet's cove the biggest cove on the east side of the lake?  Good place to fish?  I only have about 6 hours of fishing time? 

Yes and Yes.  There is moving water in the back and a large opening with hydrilla surrounded by a large pad field.  Usually a good place.

don't know for sure as to fishing conditions but this time of year, it ought to be on fire

Couple weeks ago there were some big fish coming from the mouth area of the cove, just to the south.

The big island near the cove has some good hydrilla also from what I heard.