Aymeric is absolutely the one who likes the roller coasters more. The little boy inside of him that never really got the chance to just be a little boy is rattling the bars of his mind and demanding to go on the highest, fastest roller coaster first. Synnove convinces him to work his way up to that one so that the others don't all seem lackluster in comparison.
Synnove, meanwhile and shocking no one, is really into fair food. She will try anything once, and there's all the obvious sweet treats (funnel cake, deep-fried oreos, the million and one flavors of ice cream), but she would be an absolutely sucker for roasted corn on the cob, fried pickles, and fried cheese curds. Aymeric probably eyes the curds mistrustfully, at least until Estinien swoops over to try and steal his serving, while Synnove's ignoring them both and just humming happily as she eats.