For my bfs one year anniversary I made a scrapbook of our year together. He was so impressed with it, and said it was the best gift anyone has ever given him. He is so not emotional and he was getting teary eyed! If you go that route, feel free to pm me and I can give you more details of what i did.
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"Deep down you may still be that same great guy I used to know. But it's not who you are underneath, it's what you do that defines you" Rachel Dawes, Batman Begins
A gift certificate to do something like rock climbing? Is he athletic? Other than that, I would just take him out for dinner, or do something super girly like make a basket of small treats (which actually can be expensive) but only if you know he'll think it's cute of you to be such a girl
i would try to do something together like bowling or miniture golf. also, you can maybe go back to your place for homemade dessert and a dessert wine to cap off the evening.
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"i tell you one lesson I learned
If you want to be something in life, You ain't gonna get it unless, You give a little bit of sacrifice, Oohh, sometimes before you smile you got to cry.." -The Roots