[pokerhooker]

Bet the turn; it will most likely allow you to check the river if you desire, and you've charged him to draw if he's behind.

There are way more hands you are ahead of than those which you trail; don't start checking just because you don't want to be raised. You said he's a loose player and he's shown no strength thus far. There are some opponent's whose calls you should fear; this doesn't really sound like one of them.

The board isn't even all that scary right now, it's better that you get value out of your hand now. What a shame it would be to check the turn, and then check through again when a scary Q, J, or diamond fall, only to find out that he was going to pay you off with a worse hand.