It's not always easy to beat the weak moves...

Yet another game in King's Gambit which I was desperate to win in a big way. I won the game, but not with much fascination. My opponent accepted Kings gambit's pawn and played 3...f6. I know that's a weak move and wanted to punish him severely for that, but couldn't captivate much:( At one point, the game went double edged, though I'm positionally up w.r.t pawn structure. Interested to know what should be the planning in such cases. Here is the annotated game: