比较中规中矩的
Wish you a bright future and a happy life!
祝你前程似锦，一生快乐
如果情真意切一点，可以
I will cherish all tne memories of us together!
我会将我们的美好回忆永远珍藏
再就是谚语和套话了
A friend is a gift, whose worth cannot be measured except by heart.
朋友是一种只能用心去衡量价值的礼物。
Congratulations on your graduation! Whishing you a future filled with success and joy of seeing your dreams come true.
祝贺您的毕业!希望您有一个成功的未来，感受到梦想成真的快乐。
Think of me sometimes while Alps and ocean divide us, but they ever will, unless you wish it. (Byron)
长相思，天涯海角；情不断，山水难隔。 --拜伦
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