OMI (Obliviot Motorized Infantry)
Note the tire tracks going over my flip flops, two kite stakes, and 8 lines. 5 feet from my sitting position lawn chair next to pick-up.
You need a chunk of pipe, as heavy as you are willing to carry, which you can drive in next to your handle stake. Put a banner on it if you want something decorative. Two five-foot pieces of 1/2" with a coupling should be enough, and fit in the bed of the pickup easily.
BTW, Obliviots are not found only on the sand-side of the waterline: I once had another boater try to go between my boat and the boat I was towing.