I'm not aware of the 3rd floor walk around ticket. I've been going to the Derby since 1969, and either you have a seat, or you get general admission. The 3rd floor was updated 3 years ago, and there are two simulcast areas and a food court. I believe they sell the seats for the simulcast areas. You would not have access to seeing the race. I doubt if there would be any places to sit down. General Admission gives you access to the paddock area, the infield, and the turf terrace (a small grassy area in the clubhouse turn). The best bet is to have seats for the race.