Hand 1) If he's passive he's not bluff raising the river. He also doesn't expect you to fold so I'd expect to never be good here. My guess would be 88/99/JJ/QT/J5ss/J3ss.

Hand 2) Again if he thinks, he knows you're not folding many aces for the odds you'll get when he raises. I doubt he puts you on a flush. I think he knows you have the ace after you call the flop, so I fold. I also check/call the river but I can't beat the $100. Go figure.