We are going to spend a couple of days in Charleston before going to our beach house in June. We have visited Charleston several times before and have done most of the tourist things. We've been to the aquarium, Ft. Sumter, Aircraft Carrier, the Battery, Slave market, Rainbow Row... We are all history buffs and my kids especially love Civil War history. We'd like to do a walking tour. Can someone point me to a good self-guided tour that might take us to some out-of-the way places?