[J.A.Sucker]

I think your reads are a little too narrow here. Tough players will check behind on the turn with hands sometimes, and that's the last thing you want in a big pot with draws out there. I'm sure he is putting you on a good hand, too. I would have capped up the flop and bet the turn. Since the pot is so large, the button will likely raise you with any overpair, and possibly with AK. I'm glad you got it capped up, though. Betting the river is correct, and folding is not a good idea, as others said. It worked out for you, but you could have left lots of money on the table. I hope you won a monster!