This Is how I have done that; start by finding some towns or cities on the Great Loop that you think you might like, then go to Zillow and search that area. Filter for waterfront. If you find something that looks good, find it on a chart to verify the
water is navigable. You can view or download American
charts for free at NOAA's website. That narrows it down, but the only way to really verify what
depth carries to the dock is to check it out in person of course.
Your best bets are likely going to be on both coasts of
Florida up to
Maryland, depending on what type of boat you want to keep. Remember though, it's all
hurricane country to various degrees.
Just to get you started, you might search the town of Oriental,
North Carolina, the area around
Annapolis,
Maryland, and the area around
Baltimore, Maryland. The Chesapeake is rarely impacted by serious hurricanes.
Good luck, it's can be fun to look.