Let's Plan - North East Six Flags Loop

Let's Plan - North East Six Flags Loop

I know, nothing but planning posts but I'm in IL and it's Feb, not a lot of options here. I'm looking for 

Where do I fly in? Can I do it in 9 days?

SF America
- 3 hours -
SF Great Adventure
- 3 1/2 to 4 (have to drive by Liberty) -
SF New England
- 2 1/2 hours -
SF Great Escape
- 2 to 3 hours La Ronde (if the border opens)
- another 6 to Darien Lake
- only 4 1/2 hours if have to bypass La Ronde
SF Darien Lake
- 5 hours -
Hersheypark (Break-up the longer leg)
- 2 1/4 hours -
SF America

If we go for my Birthday a flight option would be:
Fri, Aug 13 6:00 AM – 10:47 AM into DCA
Mon, Aug 23 4:45 PM – 8:26 PM