What is the best time of year to visit the Carolinas?

We are planning a trip out through Tenessee and the Smoky Mountains to the Carolina's. We are unsure of North or South, any suggestions (we have 3 kids under 5)? Also what time of year is it best to visit this area? We would like to stay away during spring break time. We want to make sure that the water... show more We are planning a trip out through Tenessee and the Smoky Mountains to the Carolina's. We are unsure of North or South, any suggestions (we have 3 kids under 5)?

Also what time of year is it best to visit this area? We would like to stay away during spring break time. We want to make sure that the water is warm enough to swim in but would prefer to do an off season to avoid crowds and high costs.

Any thoughts?
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