I have been to the Lexington a couple of times, most recently on Oct. That one is getting better and better. More of the ship is being opened up as time goes on. Even if you kind of hurry you can barely see all of it in a whole day (or maybe I'm just slow). Lots of displays in the hanger deck. A number of aircraft displayed topside. Some of it is well restored and some of it is not, so parts still have that "lived in" look.
A ferry boat runs from the seawall in front of the area hotels across the bay to where the Lexington is for a couple bucks.
The Lex is protected by some kind of double throw down anode system so the hull should be fine for a while. There's a couple of guys at work that qualified on the Lexington when it was still active.