I like Hilton Head and Corolla but they are more crowded. There is probably not low crowds with activities but maybe others have suggestions.

I've been to Emerald Isle several times, really enjoy renting a house on the beach, warm water, not too crowded. As my kid gets older, though, I think going somewhere with more to do would be nice so it can be a mix of relaxation and activities. Is there anywhere that isn't crowded but has more to do? We do take other trips, but I do appreciate a week at the beach.