Agios Georgios (better known as St. George South to avoid confusion with Ag Georgios in the north of the island), is a lovely peaceful village spread along about a kilometer of quite rocky coast, with fabulous beaches at both ends. Nightllife is low key, with plenty of good bars, restaurants and tavernas but NOT FOR CLUBBERS!
Mainly flat in St George itself, rising up to the much bigger village of Argirades on the hill, this area is great for walking and cycling. At the northern end there is the gorgeous Issos beach with its dunes and Lake Korission.
It really is a lovely place for a relaxing time. Just chill out, or go for a trip on Kostas Boat to Paxos or Sivota. If you want crazy nightlife you will have to go to Kavos (not Laganas as one of these reviews states. That is on another island!)
I also have to say that Marias photos on here are not the St George I know and love. I think they are probably of the northern Ag Giorgios)