[bozlax]

My initial reaction was "punt." When I think about it, though, and after reading the responses, I s'pose peeling on the flop is ok as UTG is unlikely to raise, so for all intents and purposes you're closing the action, and your implieds are large.

I also agree with sean that the turn is a raise. These guys are going to be so happy to be holding an ace, they aren't even going to think about your holding a 6, but if something "ugly" (like a paired board or an ace) happens on the river they're going to go back into their shells. Also, if they're not holding an ace or a 6 they're probably bailing on the turn, anyway.