Your best friend is basically your soulmate. Since you're obviously going to grow old together, this bucket list is full of things you should do between now and the time you're 80 and sitting on a porch together reminiscing about the good old days.
August 7 is International Friendship Day. This is a time to celebrate friendships and consider what it means to be a good friend. Try this lesson with young children to help them answer this question (and think about what kind of friend they are themselves!).
As a guy I think it's a shame American culture seems to discount this for boys & men; CS Lewis in _The_Four_Loves_ was right about lovers (Eros) looking @ ea. other while friends (Philia) sit side-by-side & look together @ (appreciating) the same thing.