Folding a Set When the Board is Dangerous (cash)

LAYDOWN

I flopped a big hand and checked it to encourage action. When I did this, I knew I was taking a chance because two pocket clubs could make a flush or someone could make some kind of straight. A scare card hit the turn that provided two possible kinds of flushes and a possible straight. I decided to raise to determine the strength of my opponent's hand and get some information. After getting called, seeing what the river brought and facing a lead-out bet by my opponent, I figured I was beat. What do you think?