I live about 40 minutes northeast of Mystic. Unfortunately, there are no campgrounds I would stay in at Mystic. As mentioned earlier, there are a couple of nice state campgrounds, Hammonasett and Rocky Neck. STAY AWAY from Niantic by the Atlantic. I haven't been to Aces High for a while, so I cannot comment. Laurel Locks in Salem, CT is right on Gardner Lake and is well maintained. Salem Farms, also in Salem, is nice as well, but both are a 40 minute drive.
2014 Flagstaff 27RLWS
2004 Chevy Avalanche 2500
1998 21' Thor (doesn't everyone need 2 TT's?)