Ivylog offered some good advice for North Georgia. If you are set on COE CG off Lake Lanier use either Duckett Mill or Bolding Mill. Duckett has easier access back to the main highway. Helen is about an hour north of Duckett. Both Duckett and Bolding have beautiful sites with great lake views/access. Both have Water/Elec only. One thing to consider - although season dates vary year-to-year the COE just started keeping Bolding open all year. Duckett closes very early in the year. (early September).
On edit -- you asked about other interesting things in the area --
Toccoa, GA -- where the 501st did boot camp (think Band of Brothers) Toccoa has a very interesting museum dedicated to the Army Air Corp base that was there in the '40's.
Trout fishing -- just outside of Helen is a stocked, trophy stream that has massive rainbow trout. Special regulations apply and reservations required. A very enjoyable experience.
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