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I would definitely check out Endicott and Rock Springs first. Sioux Passage would be my third choice. Creve Coeur is long and relatively straightforward, so you can certainly get away with not playing it ahead of time. If you are only playing 2 courses, I would go to Endicott first and then hit Rock Springs afterwards. They are about 30 minutes apart from each other. After you finish at Rock Springs, you would need to make the mandatory stop at Fast Eddies Bon Air for some food and beverage. This is a notoriously cheap and tasty local establishment - $1 half pound burgers, $1 homemade brats, awesome pork kabobs, big elwoods (steak kabobs), hot chick on a stick (cajun wings), and the coldest beer around (no joke). I guarantee that Rock Springs DGC gets a lot more play due to the fact that Fast Eddies is right down the hill from it! If you are going to get 3 courses in, play Endicott, then Sioux Passage and then Rock Springs...and of course STILL make sure to hit Fast Eddies!
Thanks for making thr trip and look forward to seeing you this weekend!