I go every year, its best to arrive early in the morning it gets more crowded as the day goes on so use the afternoon for second looks and just be patient. I encourage you to park at or close to Cobo I do every year with no issues, take the People Mover to Greektown for lunch I recommend the Golden Fleece and a trip to the Astoria Pastry shop for desert. It gets hot inside Cobo with all the people so do not dress to warm, you can download the floor plan from the NAIAS website so study it no where your at and want to go and you should be able to take it all in no problem, in the basement level they have offbeat things and usually a cafeteria. and you should expect gorgeous girls showing off all the car manufacturers. If you need to use the rest room try the outer ones or the basement level and you will save much time.
