Make him hunt the gift that he has wanted for a very long time now. It could anything from his favorite team’s jersey to a hobby that he wishes to inherit.
However, make sure that reaching to the gift is a difficult journey. That is when the anticipation will build up and he would be delighted to see the main gift.
If possible, record his journey to the gift on a Handycam. You will definitely get some exciting footage of your delighted boyfriend.