I'm at the Renaissance concourse now for training. I'm not sure what parking situation is but I'm pretty sure it is free...large lot right on property.

You can take shuttle every 20 minutes and they go straight to front of Delta entrance. Or you can walk...real easy to take a left out of parking lot and go through rear entrance of Delta parking lot (as long as its not a weekend or before like 5 am, or after about 730 pm because gate is closed). If gate is closed you have to walk all the way around...plan on 20 minute walk from hotel to sim if you are going long way...15 minutes if cutting through.

Make sure you ask for room facing away from airport (north side/city view) if you haven't been here before.