I saw those episodes and wondered what park it was filmed at. I thought HRP was probably it. I thought it interesting because they were on their way to Philadelphia, and at the time of those episodes they would have been in Indiana or western Ohio (since it was before they got to Columbus). The only big parks I can think of in IN and Western OH would be HW and KI, and considering HW doesn't have a big steel coaster like was featured in the episode... hmm, which park would that represent in the story then?
Well, it appears that my estimate of what park that might represent was a little off. I was on NBC's website and they have an interactive map where you can trace the characters' progress across the Monroe Republic (http://www.nbc.com/revolution/exclusives/interactive-map/). So I was clicking around to find the amusement park episode, and it was set in Lowell, Indiana, in the NW portion of the state. No park there... And yes, I know it's fictional, but it's nice to try to draw parallels with real life.