what to do w/set of 5s on river?

[Little Fishy]

I fold the river. It is such a huge overbet!!It reaks of a flush draw on the turn that hit the river... If he is bluffing, then wait and snap him off next time you make a hand.

I bet this flop against an 88/26... I would like to see what people have to say about the river bet... I can see it as nice for value were hands like AT will call... what else are you getting value from here? 56, 89 xx??

FYI: if you have seen villain put moves on like this with poor hands, then inta-call, and if you hit a flush re-buy and bust him later...