I have anchored in Thoroughfare Creek and dragged anchor in the middle of the night during a storm. One of my least favorite experiences. At the time we had a GB 36 with a 35# CQR. I doubt a newer design anchor would have done that but who knows? I would suggest they go to Enterprise Landing about a mile south of Osprey Marina. That is very protected.
Magic, 1996 Grand Banks Europa
Westport, CT and Stuart, FL