I like pre-flop to isolate the CO and play an ok hand in position against a guy who probably sucks since he open limped in a 4nl game. Sizing is fine.

On the flop you should be comfortable with betting and getting all the money in here because you have like 5 million outs against anything and his stack is short. I'm going to tend to want to bet a little more on this flop (and more than 1/2 pot on flops in general), more towards the 60%-70% range at least.

I think I prefer to just check behind on the turn. It's going to be hard to get a call out of anything you're ahead of or a fold out of anything that's ahead of you, and you have plenty of showdown equity if it just checks down on the river.