How can I convince my partner? what should I do?

im 15 and my partner is 15. we are going to cedar point next wednesday on a field trip. my partner HATES roller coasters and REFUSES to ride any of them except the iron dragon. she told me that I can ride the rides I want and she will sit outside the exit and take pictures of me or something. she will only ride flat rides (music express, tilt a whirl, scrambler). she also wants to go to the waterpark. I cant convince her AT ALL. What would you do if she was your partner?? I want to go on the dragster, millennium and the new coaster.

I'd say you should ask her to at least try one of them with you
If she still doesn't want to then let her do what she wants for a bit and then you could go over to the waterpark with her :)