Parks close early for
HHN, IOA at 5pm, USF at 6pm, both open at 9am. If you get to the gate early before 9am, you can do one park.
If money is not an object, then you could do this. See USF in the day, then pay for HHN and do the rides at IOA that night because they will stay open until 2am. Most people are doing the mazes, and the rides have short waits. That would be a very long day, and cost about $90 ($50 USF, $36.95 Upgrade Peek Night HHN) a person, but you could do it. Saturday nights sell out fast, so you'd have to book your tickets online and pick them up at the Kiosk machine.
On my day Thursday October 10th, I did IOA in the morning, over to USF in the afternoon for 1 attraction, checked in my hotel, rested, then came back to IOA for HHN. It can be done, but it's alot of walking and my feet hurt.