Originally Posted by oskar
You realize this is a blank?
Try to put him on a range:
What would he call on the flop with rather than raising?
If he is tight/passive as you say it's pretty unlikely he's going to shove/bluff the river on a scare card if you check to him. I would bet just under the pot and c/f the river.
Against a loose/passive player I would overbet the pot so he doesn't get the right implied odds, and just shove any river.
I don't agree that you're only getting raised by better on the turn. Often enough it's somebody who doesn't want to give up his draw, and doesn't want to have a decision on the river. I call a shove on the turn after the flat-call on the flop. Might be a leak.
Alternatively you can check it for pot control, but you won't make any more money in this hand, and you're giving the gazillion draws that are out there a free card.