It's the greatest to be able to realize one's dream!
Don't you think it's wonderful to be able to realize one's dream?
ご質問ありがとうございます。
① "It's the greatest to be able to realize one's dream!"=「夢を具現化できるって最高!」
② "Don't you think it's wonderful to be able to realize one's dream?"=「夢を具現化できるって最高だと思わない?」
☆「最高」を"greatest"と"wonderful"と訳しましたが、他にも "super"、"fantastic" など考えられます。
ご参考に。