South Padre Island Beach Access Surf Fishing

Hey guys I’m new here, I am going to South Padre Island over thanksgiving, and will be Surf fishing for sharks around beach access 6 or 5 on highway (100). My method of deploying bait will be with a drone, as I don’t have a kayak, and can’t carry one on my vehicle. My question for you experienced fishermen is: How many feet (or yards) should I fly out to catch some decent size sharks? I know the sandbars change, but as a approximations how far from the beach is the second sandbar over there? I’ll be using mullet / shrimp . I’m looking for medium size sharks, cheers and thanks for the help!