This was the most realistic of all the attractions I've been to
This was the most real of all the theme park attractions I've been to
「今まで体験したアトラクションの中で一番リアリティがあった」= This was the most realistic of all the attractions I've been to / This was the most real of all the theme park attractions I've been to
ボキャブラリー
一番 = most
リアリティーがある = realistic, real
今まで体験した = I've been to
テーマパーク = theme park
アトラクション = attraction
の中で = of all the