hey fellas this will be my first trip to grapevine and i know nothing about the lake i have heard that twin coves was a decent place to drift any other suggestions?

Not sure you would have a lot of room in twin coves for drifting. You might try the McPhearson slough area for drifting or by the island.
Here's a map with some of the lakes names on it. Hope it helps.
http://www.ci.grapevine.tx.us/Portals/0/park%20road%20correct%20rename%208-.pdf

If you're looking to catch shad try the area just east of Meadowmere Park. They were bunched up there on Wed. I suck at throwing a cast net and still caught more than I needed in a couple of throws.

You can get all the shad you want at the aerator by the dam.