I also proposed at Great Adventure. The now Mrs. Reflux is a non-rider, but I got her to go on the Big Wheel. We were stopped near the top, when another section was loading. I got down on one knee and heard her frantic response "STOP SHAKING THE CAR."
She said yes. If she would have said no, at least I would have still been at an amusment park.
I proposed at Cedar Point on the boardwalk. MF lift hill was my first choice, but it was broke down. So, we walked around the park and out to the boardwalk. We were standing there looking out into the lake and I asked her, "If I bought you a ring, what size would I get?" She answered and I grabbed her hand and slid the ring on her finger and asked "Is that close?" She said "yeah" and stood there and looked at me, then looked down at the ring, then back and forth. I said "Will ya?" She finally said yes once she realized what I was doing.
If I would propose at another park, It would be at Universal when Jaws popped out of the water.
My wife is into roller coasters like I am. I originally planned on proposing on the MF lift hill but the thought of dropping a very expensive ring 300 ft scared the sh** out of me. So instead I proposed at Breakers.