...then I would recommend checking out Lake Winnipesaukee in New Hampshire.
It's 72 square miles of glacial lake with 244 islands. Deepest part of the lake is ~213 feet, but you'll never go there. There are a number of interesting wrecks in the lake, as well as other great dives. Earlier this summer, I dove an interesting wall in the lake, and just last week went on two dives -- one to an area that had lots of old stuff -- antique bottles, etc. One guy on the boat found a REALLY old volt meter -- in great condition. Our second dive was the "Lady of the Lake" wreck. She was a 125' paddle-wheel steamboat, used to ferry stuff & people around the lake before being scuttled in the early 1890s. As was custom, they stripped the ship and prepared to tow it out to the deepest part of the lake to sink. The plan didn't work, and it sunk in a small cove -- and rests in 30' on a sandy bottom. It remains intact, and there are some impressive oak beams -- the likes of which you couldn't possibly find in America today. Lots of fish. Good viz. Idiot boaters ignoring dive flags.
I've been going to this lake for my entire life, and just now am getting into diving it -- it's a dream come true after 35+ years of snorkeling.
LDSs --
Dive Winnipesaukee (Wolfeboro, eastern side of the lake)
Fathom Divers (western side)
www.fathomdivers.com
DiveWinn has a boat docked (conveniently) right out behind the shop. Rentals, etc. Fri-Sat-Sun charters. Fathom works with a local boat and is located on the side of the lake with more wrecks.