GMorrison
I don't think I've ever seen a Fletcher in the flesh
Best one to visit--at least for my 2¢--is USS Kidd, in Red Stick. She's in 1945 anti-kamikaze fit, with a pole mast, five turrets, and Meas 22 paint scheme.
Cassin Young is a free tour (it sits opposite of Constitution in Boston harbor), but you only get to see the main deck. She's interesting for being one of the very few "reactivated" Fletchers retaining all five turrets. She was given a tripod mast, but retained "bedspring" air search radar.
The Sullivans in Albany, NY is an interesting trip, if a bit overshadwed by having Little Rock alongside (only preserved Light Cruiser, anywhere). She's generally in her late 60s, four-turret fit. Her 3"/50 Mk 33s may be in better shape than the four on Little Rock. Maybe.
Your Mileagae May Vary