hand 1: I'd probably jam this turn a bit harder and value bet the river a little more agressively. As played, standard should be to just call IMO. If I push here, it speaks volumes for what I think of my opponent.

hand 2: Just get it in somehow. Folding here shouldn't even be an option. If this makes you uncomfortable, just fold pf. This is about as good of a flop, save for a flopped nut straight, that you are going to see.

hand 3: I think I bet this turn, obvious fold to a raise. If he's hyper aggro and you think he'll float your flop bet with a wide range and bet with any 2 when checked to, I can see arguments for a c/c. If he can only call your flop bet with a draw or a big made hand, juts c/f. hearts and 65 both got there. These kinds of spots are tough and reads help tremendously.

As played, I'd bet this river for value, maybe $4.50 or so.