i was there a few years back...i enjoyed myself!! we stayed at a residence inn more in the atlanta area though. stone mountain was really nice. there was a steam boat that took you around the lake...there were a few plantation style homes to peek at...a train ride around the mountain...there was a museum there too. when i was there, there was a gone with the wind exhibit that has since left. we took the tram thing up to the top of stone mountain, which was cool, but then we decided to walk down the mountain...whew!! if you do that, make sure you wear good shoes!!! i thought i was gonna die by the time we reached the bottom!!
overall, i enjoyed myself there and i would go back!!