[The Rat Pack]

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Check behind and take a free card. If you hit your staight and he had something with which to c/c the flop planning to crai on the turn, then you'll bust him on the river.

You also retain the option to bluff at a blank river (or scarecard river) if he checks that to you as well. So, check.

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I think this is your best option. Also, alot of weak players at this level will bet the min or something close to it with a real weak hand they just want to showdown. If this happens I raise em pretty big and you will most likely take the pot.