During my time off from work, I took some time to go rowing and sailing. The weather was fairly warm, although fog rolled in on the weekend after Christmas. It's nice to get out on the water, anchor the sailboat, and then row to shore to explore some of the places around Charleston Harbor. Crab Bank is a favorite anchorage as is Cummings Point.
These are great spots to get photographs, although Crab Bank is a protected rookery that is only available for human visitation after October and through the winter months. In the spring and summer, it is inundated with pelicans, gulls and other water birds. No dogs are allowed on Crab Bank but you can bring dogs to Morris Island.
Morris Island has a great beach for exploring and looking for shells and shark's teeth. You can walk for several miles and not see another soul in the winter. In the summer, weekenders come with their motor boats and like to cook out or party at Cummings Point. It can get a bit noisy but the winter months are sheer bliss.
If you want to camp with your dog in the winter, there is driftwood near the beach. There is no potable water so you have to bring that as well as any food or supplies you might need. I haven't tried camping there yet but hope to soon. Also, the Morris Island Lighthouse is a beautiful sight on the ocean side of the island. It's a hike but worth it to see the old lighthouse. It's now being worked on to stabilize the base.