What are some of the best things to do in South Carolina in January?

Almost any outdoor activities like golf, tennis bicycling, walking or hiking. Coastal South Carolina has a great winter season with most days reaching the low to mid 50s with many in the 60s. All of those activities can be enjoyed in the three areas you mention. January is a great time to tour around Charleston, do the historical walking tours and carriage rides without the presence of high humidity and mosquitoes.