Santee is a big body of water, so fishing with a Kayak it would make the most sense to be able to fish near where you are staying. Not many places still offer camping the old fashion way with tents so that reduces some possibilities. I would consider calling Poplar Creek Landing, Poly's Landing, Bells Marina, and Taw Caw. All four are on nice black water creeks that offer decent fishing near the boat ramps and camping areas.