I agree with Growler. I just made my first trip to Kansas City and I was advised to stay OUT of the state of Kansas (proper) and stay in the Plaza area. Just be discreet and you should be fine.
I certainly enjoyed my recent trip there. But I'm so different in body shape and what I offer than you are, not sure if my statements are much help or not. But I would guess that young, slim and cute would do very well.
EVERYONE suggested that I try the barbeque and one nice man actually took me to a place to try some. It was VERY good but I'm hoping to return in April, and wish to try a few different restaurants that specialize in that food as well.
Also, when planning your trip, the taxi ride from the airport to the Plaza area is around $60 one way. So when budgeting for your trip, try to check out shuttles and special friends to pick you up. I was blessed with that for my arriving trip. (Edited to add: If you drive, I have no suggestions! Just noticed your Springfield location!)
A final hint, I found the hotels to be rather expensive all things considering. Where I stayed was very nice and the staff were great, but my hotel cost was more than what I spend on say ... staying on the Magnificent Mile in Chicago. Priceline wasn't as great there as it is in other cities.
It could have been the weekend (playoffs, St. Patrick's Day) but as I'm checking prices for this upcoming April, I'm not seeing much differences in rates. Just something else to consider in your planning.
Good luck!
Sincerely,
Elisabeth
P.S. When I was considering going to St. Louis after my trip to KC, I considered taking the bus. I know that the Megabus has a route from KC to St. Louis for like $8 one-way. Not exactly sure the rate but it was cheap enough for me to consider using it instead of flying. I have never tried the Megabus but I would be up for the adventure. Just another thought. Maybe they have a similar route from your neck of the woods.