Dive Winnipesaukee in Wolfeboro (divewinnipesaukee.com) run Friday evening charters on their boat -- docked right behind the shop in Wolfeboro. Friday is a one-tanker. Great operation -- helpful, friendly, knowledgeable staff. There are also plenty of good shore dives to be had throughout the region. A good summary of some of the more popular sites can be found here:
http://aquaticspecialties.net/divesites.html
Viz: Far from Bermuda, and depends on the location (72 square miles of lake...lots of variety in everything, including viz). But lots to see & find.
(
BTW...I'm an Evans, too...)