A big hand with a maniac and a TAG...

[LateFlag]

Preflop and flop are standard, given the maniac.

The turn is a little spewy IMO. BB is not folding a better hand, and the maniac's cap doesn't tell you anything interesting besides that he's a maniac and even maniacs sometimes get dealt AA.

I check down the river too. At this level, lots of villains will get scared because of the four-straight flop on a multiway hand even with hands that beat you. My response on this street is biased at least a little by the fact that I don't think you were ahead on the turn.