I visited Charleston and Savannah in March.
Husk is amazing but it's booked forever. If you can make it, there's also a Husk in Savannah that's less busy but also awesome. Savannah is worth going to for a day or two anyway if you can make it (bonus points if you watch/read "Midnight in the Garden of Good and Evil" since it's set there before you go).
There's a lot of fun historical tours around Charleston that are worth going to 😀 But definitely go to Hominy Grill and Husk for food.
Also check out Bar Normandy, FIG, Darling Oyster Bar, and Little Jack's Tavern (great burgers).
There's Hannibal's kitchen for gullah cuisine
Look into plantation tours and ghost tours
HMm, I'll see if I can think of anything else. LMK if any specific questions