Walking the beach during the evening/night is fine. Walking on the hard pack closer to the water will keep the hustlers/hastlers from approaching you most of the time. Common sense should always be in play and I would suggest that you not do any "shopping" with any hustlers on the beach unless you know them and even then, for me...not (they will likely claim to know you.......) I personally don't do any "shopping" on the beach. If you get approached just give them a polite NO wave or shake of the head and keep walking. Having a small flashlight is good too. Just walk, relax and listen to the sounds around you, you'll love it.