You will need picture ID and a copy of your Birth certificate together, or if you a passport that' ll do all by itself. I used to cross the border alot using only only an ID, but since 9/11 them days are gone. Kip had good advice. Be straight up with customs folks and don' t BS them. If you answer their questions and don' t try to be a comedian you' ll buzz right through.
I' m not positive, but I don' t think you have to declare a bow like you do firearm. That would be something worth checking on.