[effang]

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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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at SSNL it's really bad to fire river without betting turn. you get looked up super light. To thinking players, they may/may not fold depending on if river is a face card, but in general it's only one more bet to "see" your cards, and of course you're always on air anyways.