Taking nephew fishing for Hybrids/Sandies Sunday the 21st

I am normally a bass fisherman, but do enjoy all types of fishing. My Nephew is living in Rockwall for the Summer (home from college) and wants to go fishing. I want to take him to Ray Hubbard, but bass fishing isn't usually a high numbers fish especially on Hubbard in the Summer.

I want to take him to catch some Sandies/Hybrids. I might only get one chance to get out to the lake and scout around before we make the trip.

Any pushes in the right direction or help on locating fish first thing in the morning would be a great help. Techniques would be appreciated as well.

Thanks!

Joey