St. Louis - downtown
Planning ahead for an April visit, coming to town for the marathon. We'll be staying at the Adams Mark. Looking for decent pasta (though not necessarily Italian) for the night before the race, and an interesting place for a protein fix post-race. We don't want to have to dress up too much, business casual would be okay. Ideally we want someplace a short walk from our hotel, but we can drive if it's worth it to get good chow. More important, want a place where we won't have to fight a big crowd or stand on any kind of line, in a smoke-free atmosphere.
The Adams Mark contains a number of restaurants; I had brunch there and it was very nice. The other restaurants I have enjoyed within walking distance of your hotel are also associated with hotels: "401 Olive" in the Hilton and "Clark Street Grill" at the Westin. If your protein fix means steak, then Carmine's Steak House is a two-block walk down 4th Street.
I throw this out as a runner myself.
I personally have to be very careful about what I eat the night before a marathon / half-marathon, as the intake of Gatorade and Gel sends my stomach further over the edge and any help from the previous days eating is unwanted.
First, you have the option of going to the marathon's carbo-loading pasta dinner. I can't vouch for it, I've never been.
My personal pre race meal is spaghetti and meatballs at Guido's on the hill. It's simple, it's tasty, and it's something that I know isn't going to leave me feeling ruined come the following morning.
I also considered going to Mangia Italiano last year, but it's usually pretty busy, and I didn't want to deal with.
Neither of these choicese is walking distance from your hotel, though the pasta party is sort of walking distance.
10th streeet Italian is downtown on 10th street, but I'm not sure how late it's open.
Kitchen K probably has some pasta, but it's going to be busy I'd think as well.
I'd venture to guess that most of the hotels downtown, including the Adam's Mark have some kind of pasta on their in house restaurants menu, and I'm of the opinion that the blander the better. Save the money for the post race after party when you can eat and drink whatever you want to toast your success.
Good luck by the way!